It was 9.35 am in Rakhi's watch, which kept correct time, when Reena informed her that the last bus left the bus stop at 9.25 am. Reena's watch is 5 minutes fast. The frequency of the bus is every 20 minutes. For how long must Rakhi wait to catch the next bus ?
1) 5 minutes
2) 10 minutes
3) 15 minutes
4) 25 minutes
5) None of these

Options

A. 15 minutes
B. 10 minutes
C. 25 minutes
D. 5 minutes

Answer

D

Explanation

According to the questions, the last bus left at
(9.25a.m-5 minutes) =9.20a.m. correct time.
[ `:.` Nada.s watch is 5 minues fast]
So, next bus will leave at (9.20 am+20minutes) =9.40 am
Therefore Deepa must wait for (9.40am -9.35 am)