A class starts at 10 a.m. and lasts till 1.27 p.m. Four periods are held during this interval. After every period, 5 minutes are given free to the students. The exact duration of each period is (a) 42 minutes    (b) 48 minutes    (c) 51 minutes    (d) 53 minutes

If 4/5 of a water tank is filled in 1 hour, how much time will be required to fill the rest of it? (a)20 minutes (b) 15 minutes (c)12 minutes (d) 10 minutes

A squirrel starts climbing up a tree at the speed of 6metres a minute but after every 6 metres it slips down 4 metres in the next minute.It will be able to reach the top 120 metres high in ( a) 20 minutes (b) 60 minutes (c) 115 minutes (d) 1(1)/(2) hours

A movie started at 11:00 a.m. and ended at 2:15 p.m., including an interval of 15 minutes. Then the ratio of movie time (excluding interval) to interval is

How much does a watch lose per day if its hands coincide every 64 minutes? (a) 37 minutes (b) 32(8)/(11)backslash m in utes (c) 31minutes (d) None

There are two clocks, both set to show 10 pm on 21st January 2010. One clock gains 2 minutes in an hour and the other clock loses 5 minutes in an hour. Then by how many minutes do the two clocks differ at 4 pm on 22nd January 2010? (a) 126 minutes (b) 136 minutes (c) 96 minutes (d) 106 minutes

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

A , B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting point? (a) 26 minutes 18 seconds (b) 42 minutes 36 seconds (c) 45 minutes (d) 46 minutes 12 seconds

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?