Question

A watch gain 8 seconds in 4 minutes and was set right at 4 am. What time will it show at 11 pm on the same day?

Answer 1

Answer: 19 hr × 60= 1140 min

1140/4= 285 min

285 × 8 = 2280 sec fast

2280/60 = 38 min fast

Ans is:- 11:38

Answer 2

Answer:

Incorrect watch will show 11:38pm at 11pm.

Step-by-step explanation:

Given:

A watch which gain 8 seconds in 4 minutes and was set right at 4am.

Need To Find:

We are asked to find out time at which it show at 11 pm on the same day.

Solution:

According to question,

It gains 8 Seconds in 4 Minutes

Extra time it gains in one hour = $\frac{60}{4}\times8$ = 120 seconds

which mean it gains 120 Seconds in one hour.

Also, it was set right at 4AM.

So,

Hours between 4AM to 11PM (on the same day) = 19 hours

So, total seconds gain in 19 hours = 19 × 120 = 2280 Seconds.

Now, 2280 Seconds = 38 Minutes( i.e 2280/60)

Hence, incorrect watch will show 11:38PM at 11PM.