The ratio of the speed of boat in still water to the speed of stream is 16 : 5. A boat goes 16.5 km in 45 minute upstream , find the time taken by boat to cover the distance of 17.5 km downstream .

A train passes a platform in 40 sec and a woman standing on the platform in 30 sec . the speed of the train is...

A train 125 m long passes a person , running at 8 km / hr in the same direction in which the train is going in...

There are two numbers , 1 st number is 12 more than the 2nd number . The average of the two numbers is 19. If...

Sum of 4 consecutive even numbers is greater than consecutive odd numbers by 81. If the sum of the least odd a...

A number is as much greater than 36 as is less than 86 . Find the number.

X, Y and Z can do a piece of work in 6 hours. X and Y can do the same work in 8 hours and Z can the same work...