1. By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than his usual time. The usual time taken by him to reach his office is

2. In a 100m race, Kamal defeats Bimal by 5 seconds. If the speed of Kamal is 18 Kmph, then the speed of Bimal is

3. A train, 240 m long crosses a man walking along the line in opposite direction at the rate of 3 kmph in 10 seconds. The speed of the train is

4. A boatman rows 1 km in 5 minutes, along the stream and 6 km in 1 hour against the stream. The speed of the stream is

5. A train 270 metre long is running at a speed of 36 km per hour, then it will cross a bridge of length 180 metres in:

1. What must be added to each term of the ratio 7:11, so as to make it equal to 3:4?

2. Two number are in the ratio 7:11. If 7 is added to of the numbers, the ratio becomes 2:3.The smaller number is

3. Two numbers are in the ratio 1 : 3. If their sum is 240, then their difference is

4. What number should be added to or subtracted from each term of the ratio 17: 24 so that it becomes equal to 1:2?

5. Ifx: y=4:5, then (3x+y): (5x + 3y) =

1. If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?

2. 7 men can complete a piece of work in 12 days. How many additional men will be required to complete double the work in 8 days?

3. One pipe fills a water tank three times faster than another pipe. If the two pipes together can fill the empty tank in 36 minutes, then how much time will the slower pipe alone take to fill the tank?