20. A clock is set at 5 a.m. The clock loses 16 minutes in 24 hours. What will be the true time when the clock indicates 10 p.m. on 4th day?
A. 9 p.m B. 10 p.m
C. 11 p.m D. 12 p.m
Answer:
Time from 5 a.m on a day to 10 p.m.on 4th day = 89 hours.
Now 23 hrs 44 min. of this clock = 24 hours of correct clock.
Therefore 356 / 15 hrs of this clock = 24 hours of correct clock.
89 hrs of this clock = (24 x 15/356 x 89) hrs
= 90 hrs
So, the correct time is 11 p.m.
