Boats and Streams with Explanation

Q1. A boat travelling along the stream covers 16 km in 2 hours. It covers the same distance against the stream in 4 hours. Find the speed of the boat in still water?

A. 6 km/hr B. 4 km/hr
C. 8 km/hr D. 10 km/hr

Q2. A man rows 1 km downstream in 10 minutes and runs 2 km upstream in 1 hour. How much time will he take to go 5 km in still water?

A. 1 hour B. 1 hr 30 min
C. 40 minutes D. 1 hr 15 min

Q3. The speed of a motorboat going against the stream is 8 km/hr, and the speed of the stream is 2 km/hr. Determine the speed of the motorboat in downstream?

A. 10 km/hr B. 14 km/hr
C. 12 km/hr D. 6 km/hr

Q4. A boat takes 4 hours to cover a certain distance running downstream, while it requires 8 hours 48 minutes to cover the same distance. Find the ratio between the speed of the current and the speed of the boat?

A. 1 : 2 B. 3 : 8
C. 2 : 3 D. 4 : 3

Q5. A paddleboat can row at 13 km/hr in still water. Find the time taken by the paddleboat to travel 68 km along the stream, if the speed of the stream is 4 km/hr.

A. 4 hours B. 3 hours
C. 5 hours D. 2 hours

Q6. The time taken by a man to travel 36 miles downstream is 90 minutes less than to go the same distance upstream. The speed of the man in still water is 10 mph. Find the speed of the stream?

A. 5 mph B. 3.5 mph
C. 2 mph D. 2.5 mph

Q7. A man takes 50 minutes to go to a place and come back. If his speed in still water is 7.5 km/hr and the river is running at 1.5 km/hr, what is the distance of that place?

A. 4 km B. 7 km
C. 5 km D. 3 km