A swimming pool opens at 7:45 a.m. and closes from 1:30p.m. to 3:30 p.m. Thereafter it remains open till 5:30 p.m. Find the duration for which the swimming pool remains open?

An office opens at 9 a.m. and closes at 5.30 p.m. with a lunch break of 30 minutes. What is the ratio of lunch break to the total period in the office?

A swimming pool 70 m long, 44 m wide and 3 m deep is filled by water flowing from a pipe at the rate of 30,800 cm^(3) per second. The time taken to fill the swimming pool is:

An office opens at 9 a.m.and closes at 5p.m. with a lunch interval of 30 minutes.What is the ratio of lunch interval to the total period in office?

A boy slept at 9.45 p.m. and woke at 5.30 a.m. next morning. How much time did he sleep?

Two persons A and B wear glasses of optical powers (in air) P_1 = + 2 D and P_2 = + 1D respectively. The glasses have refractive index 1.5. Now they jump into a swimming pool and look at each other. B appears to be present at distance 2m (f rom A) to A. A appears to be present at distance 1m (from B) to B. The refractive index of water in the swimming pool, in the form (X)/(10) and find X.

A bus starts its journey at 5:30 a.m. and reaches its destination at 9:15 p.m. with a stoppage time of 2 hours. Find the ratio of the stoppage time to the total journey period.