Unique Academic Board Solutions for Exercise 1: Practice Exercise

A man can row $9\frac{1}{3}$ km/hr in still water and finds that it takes time thrice as much time to row up than as to row down the same distance in the river. The speed of the current is:

A boat goes $40$ km upstream in $8$ hours and a distance of $36$ km downstream in $6$ hours. The speed of boat in standing water is:

Speed of a boat in still water is $9$ km/hr and the speed of the stream is $1.5$ km/hr. A man rows to a place at a distance of $105$ km and comes back to the starting point. The total time taken by him is:

The speed of boat in still water is $10$ m/s and the speed of the stream is $6$ m/s. If the boat is moving upstream and again downstream, what is the ratio of time taken to cover a particular stretch of distance in each direction? 

A man rows a distance in downstream in $45$ min and the same distance in upstream in $75$ min. What is the ratio of speed of the stream to the speed of the boat in still water?

If a man takes $2$ hours to row $7$ km in upstream and $15$ km in downstream, what is the speed of the current (in kmph)?

A man can row $1$ km in upstream in $20$ minutes and downstream in $15$ minutes. What is the speed of the current?

A man can row $1$ km in upstream in $20$ minutes and $1$ km downstream in $15$ minutes. What is his speed of rowing in still water?