Question

a watch gains 5 seconds in 3 minutes and was set right at 8 am. what time will it show at 10 pm on the same day?

Answer 1

time gain in 1 hour = 5× 20 sec= 100 sec
therefore time between 8am to 10 pm=14 hour
therefore time gain in 14 hour = 100×14
= 1400 sec
= 23 min ( approx)

Answer 2

Answer:

Time gain in 14 hour is 1400 seconds.

Step-by-step explanation:

Given : A watch gains 5 seconds in 3 minutes and was set right at 8 am.

To find : What time will it show at 10 pm on the same day

Solution :

A watch gains 5 seconds in 3 minutes

1 hour = 60 minute

Time gains 5 seconds in 3 minutes

In 1 hour it is 20 minute

Time gain in 1 hour = $5\times 20= 100$ seconds

Time between 8 am to 10 pm= 14 hour

Therefore, time gain in 14 hour is

$=100\times 14$

$=1400$ seconds

Approximately 23 minutes.