A mixture of alcohol and water contains 35% alcohol by weight. If 25 g water is added to such a mixture of 100 g, then the percentage of alcohol in the mixture is

A man rows 20 km upstream and back again to the starting point in 110 minutes. If the speed of stream is 2 kmph, then the speed of rowing in still water is

A man pays 40 times the annual rent to purchase a building. The rate % per annum he derives from his investment is

A train with 90 kmph crosses a bridge in 36 s. Another train 100 m shorter crosses the same bridge at 45 kmph. The time taken by the second train to cross the bridge will be

A certain sum is lent at a certain rate of compound interest. It grows to 1.44 times its value in 2 years. If the same sum is lent at simple interest at the same rate, in how many years would it double itself?

A boy covers a certain distance on a toy train. If the train moved 4 kmph faster, it would take 30 minutes less. If it moved 2 kmph slower, it would have taken 20 minutes more. The distance is

In a rhombus, the length of the two diagonals are 40m and 30m respectively. Its perimeter will be

A pump can be operated both for filling a tank and for emptying it. The capacity of tank is \(2400\ m^3\). The emptying capacity of the pump is \(10\ m^3\) per minute higher than its filling capacity. Consequently, the pump needs 8 minutes less to empty the tank as to fill it. Th…

The length of canvas 1.1 m wide required to build a conical tent of height 14m and the floor area \(346.5\ m^2\) is