A car can finish a certain journey in 10 hours at a speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (km/h) must be increased by:

The speed of a  boat in still water is 20 kmph and the rate of current is 4 kmph. The distance travelled by the boat downstream in 30 minute is

A is twice as fast as B and B is thrice as fast as C. The Journey covered by C in  42 minutes will be covered by A in.                                           

A man cover a certain distance in 3 hours 36 minute if he walks at the rate of 5 km/hr. If he covers the same distance on cycle at the rate of 24 km/hr, then the time taken by him in minute is__

B starts 4 minutes after A from the same point, for a place at a distance of 7 miles from the starting point. A on reaching the destination turns back and walks a mile where he meets B. If A's speed is a mile in 8 minutes then B's speed is a mile in ____ minutes.

Running at the speed of 3 km/hr., a person reaches his destination 10 minutes later than usual time. if he increases his speed by 1 km/hr., he reaches his destination 15 min earlier. and the distance to his destination.

A is twice fast as B and B is thrice as fast as C. The journey covered by C in 78 minutes then time taken by A to cover the same journey is-

A man crosses a diagonal of a square in 1.5 minutes with the speed of 4 k/h then the area of the square is -