Raju started a piece of work when the hours hand and minutes hand in a wall clock are at 9 and 12, respectively. He completed his work when the hours hand is at a midway between 11 and 12, while the position of the minutes hand is at 6. Find the time taken by him to do the work.

Answer

2.5 hours

Explanation

`t_(1)` = 9:00
`t_(2)` = 11:30
Time taken = 11.30 - 9:00 = 2 hour 30 minutes = 2.5 hours.