Discussion Forum



1)

A watch which gains uniformly was observed to be 5 minutes slow at 6:00 a.m on a Tuesday. On the subsequent Monday at 12:00 noon, the watch was 20 minutes faster. When did the watch show the correct time?


A) 12 : 00 noon Tuesday.

B) 12 : 00 midnight Wednesday.

C) 12 : 00 noon Wednesday.

D) 12 : 00 morning Friday.

E) 12 : 00 noon Saturday.

Answer:

Option C

Explanation:

The number of hours from 6 : 00 am. on Tuesday to 12 : 00 noon on Monday =<£ x 24 + 6 = 150 hours.

In 150 hours, the clock gained 5 + 20 = 25 minutes.

But to show the correct time, the clock has to gain 5 minutes

There for, (5/25) x 150 = 30 hrs.

30 hours from 6 : 00 am on Tuesday is 12 : 00 noon Wednesday.