NTSE Stage 2 MAT 2019 Exam Question Paper

Question : 49 of 100

Marks: +1, -0

A watch gains 10 seconds in 3 minutes. It was set right at 9 A.M. In the evening of the same day, when the watch indicates half past 6 o’ clock, the true time is

5:30:00 P.M.
5:48:10 P.M.
5:58:20 P.M.
6:08:20 P.M.

Validate

Solution:

Now, total time from 9 A.M. to 6:30 P.M.
= 9 hours 30 minutes
= 570 minutes
In 3 minutes - 10 seconds gain
In 570 minutes

=\;\;{10}/{3}×\;\;{570}/{60}=\;\text"minutes"\;

=\;\;{190}/{6}\;\text"minutes"\;=31\;\;{4}/{6}\;\text"minutes"\;

=31+\;\;{4}/{6}×60

= 31 minutes 40 seconds
So, true time = 31 minutes 40 seconds before

6:30⇒5:58:20\;\P.\M.

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