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Boats and Streams Questions and Answers
Q1. A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively ?
A. 8 : 3
B. 7 : 3
C. 2 : 1
D. 3 : 2
Q2. A man can row 7.5 km/h in still water. If in a river running at 1.5 km/h, it takes him 50 min to row to a place and back, how far off is the place ?
A. 3.6 km
B. 7 km
C. 3 km
D. 8.2 km
Q3. A man can row three – quarters of a kilometre against the stream in 45/2 minutes. The speed (in km/hr) of the man in still water is :
A. 2
B. 3
C. 5
D. 4
Q4. A man’s speed with the current is 15 km / hr and the speed of the current is 2.5 km / hr. The man’s speed against the current is :
A. 8.5 km/hr
B. 9 km/hr
C. 12.5 km/hr
D. 10 km/hr
Q5. There is a road beside a river . Two friends stared from a place A moved o a temple situated at another place B and hen returned to A again . One of them moves on a cycle at a speed of 12 km/hr . While the other sails on a boat at a speed of 10 km/hr . If the river flows at the speed of 4 m/hr . which of the two friends will return to place A first ?
A. 6.9 km/hr
B. 12.4 km/hr
C. 8.4 km/hr
D. 10.4 km/hr
Q6. At his usual rowing rate, Rahul can travel 12 miles downstream in a certain river in 6 hours less than it takes him to travel the same distance upstream. But if he could double his usual rowing rate for his 24 – mile round trip, the downstream 12 miles would then take only one hour less than the upstream 12 miles. What is the speed of the current in miles per hour ?
A. 7/3
B. 6/3
C. 4/3
D. 8/3
Q7. A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water ?
A. 1 hour
B. 40 minutes
C. 1 hr 30 min
D. 1 hr 15 min
Q8. A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is :
A. 2 mph
B. 3 mph
C. 4 mph
D. 2.5 mph
Q9. A motorboat, whose speed is 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km / hr) is :
A. 5
B. 4
C. 6
D. 10
Q10. A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water ?
A. 8 km/hr
B. 6 km/hr
C. 4 km/hr
D. 10 km/hr
