A man takes 3 hours 45 minutes to row a boat 22.5 km downstream of a river and 2 hours 30 minutes to cover a distance of 10 km up stream . Find the speed of the river current in km /hr.

A man can row 6 km / hr in still water. If the speed of the current is 2 km / hr. it takes 3 hrs more in upstr...

A train 150 m long passes a pole in 15 seconds and crosses another train of the same length travelling in oppo...

The ratio of the speeds of a train and a man 6 : 1 . The length of the train is 650 m and crosses a pole in 1...

If the numerator of a fraction is increased by 150% and the denominator of a fraction increased by 200% fracti...

A number when divided by 627 leaves a remainder 43. By dividing the same number by 19 , the remainder will be_...

A computer can perform 30 identical tasks in 6 hour. At that rate, what is the minimum number of computers tha...