Question

a watch which gains 5 seconds in 3 minutes was set right at 7 a.m. inthe afternoon of the same day when the watch indicated quarter past4 o'clock the true time i

Answer 1

4o clock.
gain in every 3 minutes is 5 secs.
in every hour= 60/3×5= 100 secs
in 3 hours= 300 secs= 5 minutes.
from 7 am to 4pm= 9hours
total gain = 15 minutes