DELHI POLICE MATHS QUIZ

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Question 1:

A man takes 2 hours to swim 25 km downstream. He swims 19 km upstream in the same time. What is the speed (in km/hr ) of the current ?

Question 2:

A motor boat has speed $30 \mathrm{~km} / \mathrm{h}$ in still water. It goes $60 \mathrm{~km}$ down stream and comes back in $\frac{9}{2}$ h. What is the speed of the stream?

Question 3:

A man can row the boat d km downstream and the same distance upstream in 14 hours. Also he can row the boat 5d km downstream in 12 hours. In what time (in hrs) he can row d km distance in upstream?

Question 4:

A boat goes 24 km upstream in 6 hours and travels the same distance downstream in 144 minutes. What is the speed of the current?

Question 5:

A boat can row $72 \mathrm{~km}$ downstream and 48 $\mathrm{km}$ upstream taking 8 hours each time. What is the speed of the water current? (in $\mathrm{km} / \mathrm{hr})$

Question 6:

The time taken by a boat to row 21 km with the stream is same as the time taken by it to row 12 km against the stream. If the speed of boat in still water is 5.5 kmph, find speed of stream?

Question 7:

A motorboat covers a distance of 48 km upstream in one hour more than the time taken to cover the same distance downstream. If the speed of the current of the river is 4 km/h, then what is the speed (in km/h) of the boat in still water?

Question 8:

A man can row at $9 \mathrm{~km} / \mathrm{h}$ in still water. It takes him equal time to go $33 \mathrm{~km}$ downstream and to go $21 \mathrm{~km}$ upstream. Find the speed of the stream (in $\mathrm{km} / \mathrm{h})$.

Question 9:

A boat takes 2 hours to cover a certain distance downstream, but it takes 3$\frac{1}{4}$ hours to cover the same distance upstream. If the speed of the stream is 5 km/h, then what is the speed (in km/h) of the boat in still water?

Question 10:

A man rows down a river 30 km in 6 hrs with the stream and returns in 10 hrs. The speed at which he rows in still water is: