Hello students! Welcome to DILR Concept 8

Concept name:– Clocks

Concept explanation:   In one hour minute hand travel 360^o and Hour hand travel 30^o  

Sample set: Read the information given below and answer the questions that follows:

Q) At what times between 4’0 Clock and 5’0 Clock, will the hour hand and minute hand be 87^o apart from each other for the first time?

Ans. At 4’0 Clock, the minute and hour hand are 120^o apart. So the Relative speed between both hands = 330^o/hr. They need to travel relatively 33^o so that angle becomes 87^o

Time =  (33/330)hrs =  (1/10) hr = (1/10) * 60 mins = 6 mins

So time will be 4:06

Level of difficulty: Easy

Hope you understood solving questions on Clocks

Happy learning!

Rahul Sir

CAT Coach

Quora profile: https://www.quora.com/profile/Rahul-Anand-51