







When are the hands of a clock perpendicular? 
20180111 

Nazrul pose la question : How many times in a day are the hands of a clock perpendicular to each other? How can I find the times? Please help me. Penny Nom lui répond. 





A clock takes 3 seconds to strick the hour of 3 o'clock 
20120309 

saptarshi pose la question : [ A clock takes 3 seconds to strick the hour of 3 o'clock. How many seconds will it take to strick 9 o'clock?] Robert Dawson lui répond. 





The equation of a circle 
20101020 

Silvan pose la question : Hi, I just want to find the x,y values for the circumference of a circle...
Lets take a clock having its centre at (0,0) in a graph.
I just want to know how to find the (x,y) coordinates for the curved path or the surface of the circle..
Is there any formula to directly align the curved path or the circumference of the circle in a graph for a known radius of a circle..
I feel it will be useful for me to draw a clock in a graph... :) Penny Nom lui répond. 





The distance travelled by a minute hand 
20100306 

Patric pose la question : How much distance will the minutes hand of length 14mm of a clock
cover in moving from 5 to 10? Penny Nom lui répond. 





Percentage of an hour 
20081015 

JESSICA pose la question : HI I AM IN GRADE 7 AND FOR MATH HOMEWORK MY TEACHER ASKED US
TO MAKE 8 DIFFERENT TIMES(clocks) AND TELL HIM WHAT THE PERCENTAGE
FOR THE TIME IS.
BUT I DON'T KNOW HOW TO CONVERT TIME TO A PERCENT.
PLEASE HELP ME??!!??
JESSICA
SEVENTH GRADE Penny Nom lui répond. 





The angle between the hands on a clock 
20080404 

Kristin pose la question : The question I need help with is : Bobo looked at the clock at 1:25. What was the precise measure of the angle formed by the hour and minute hands of the clock? Assume that each of the clock hands moves at a constant rate continuously around the face of the clock. Thus, in any given fractional part of an hour, each hand will move that same fractional part of an hour's worth of movement. Stephen La Rocque lui répond. 





A 24 hour clock 
20080131 

CARLA pose la question : at a certain time i looked at a 24hour digital clock and noticed some things about the time. (1 The number in the hours section plus the number in the minutes section makes 60.(2 One of the digits in the minutes section is the square root of the other digit in the minutes section.(3 The sum of the digits in the minutes section is the number in the hours section reversed. what is the time? Penny Nom lui répond. 





Partitioning a clock face 
20071219 

Kim pose la question : Using a clock with a regular circular faced dial, draw two straight lines such that the sum
of the numbers in each of the three areas is equal. The team at Math Central lui répond. 





Rate of change of distance between the clock hands 
20070605 

Jonathan pose la question : A certain Clock has a minute hand with a length of 4 inches long and an hour hand with a length of 3 inches long. How fast is the distance between tips of these hands changing at 9:00? Stephen La Rocque lui répond. 





Angle of clock hands 
20070131 

Sophia pose la question : How many degrees are in the aute angle formed by the hands of a clock at 2:20 p.m.? Stephen La Rocque lui répond. 





A clock chimes 7 times in 7seconds 
20040502 

Anna pose la question : A clock chimes 7 times in 7seconds. how long does it take the clock to chime 10 times? Penny Nom lui répond. 





10 hours before 7:15 
20021027 

Jessica pose la question : It is evening 7:15. What time would it be 10 hours earlier? Penny Nom lui répond. 





Counterclockwise 
20010914 

Rolanda pose la question : When Descartes invented the coordinate system he decided to number them counterclockwise. Why? Chris Fisher lui répond. 





When did the man go out? 
20001214 

Rajesh pose la question : A man goes out in time between 5 and 6 and when he comes back he observes that two hands have interchanged position. Find when the man did go out? Penny Nom lui répond. 





Three problems 
20001214 

Sarah pose la question : Hi, my name is Sarah, and I'm asking this question on behalf of niece who is in secondary two. Thank you. Q1. What is the angle formed by the hour hand and the minute hand of a 12 hour clock at 5.50pm. . . . Penny Nom lui répond. 





Why counterclockwise? 
20000221 

Drew pose la question : Why do the numbers of quadrants in a graph increase in a counter clockwise pattern? Why aren't they numbered increasingly in a clockwise pattern? Chris Fisher lui répond. 





A goofy clock 
19991120 

Kate pose la question : While repairing a watch, a jeweler removed the hands and inadvertently replaced the hour hand on the min. spindle and vice versa. he set the hands to read 2:00pm, which was the correct local time when I picked up the watch. A few minutes later, I noticed that the hands were taking goofy positions. What was the first time thereafter that the watch would show the correct local time? Chris Fisher lui répond. 





Clockwise or Counterclockwise? 
19991027 

Tim pose la question : A particle moves around the circle x^{2} + y^{2} = 1 with an xvelocity component dx/dt = y  Find dy/dt
 Does the particle travel clockwise or counterclockwise around the circle? Why?
Harley Weston lui répond. 





Modular Arithmetic 
19990204 

Leslie Kupper pose la question : I am trying to do a project on modular arithmetic. I was wondering if there were any websites that include a sample lesson plan on modular arithmetic for any grade level. Let me know where and how to find them. Thanks. Harley Weston lui répond. 





Hour Hand Movement 
19980419 

Chris and Angela Bradley pose la question : My wife and I are haveing an argument over the answer to this question, what is the total number of degrees through which the hour hand of the clock moves in 3 hours and 18 minutes? Thanks in advance. Chris Fisher lui répond. 





Clock Arithmetic. 
19980309 

Joann Dixon pose la question : What is clock mathematics? Patrick Maidorn lui répond. 

