A boat goes 30km downstream in 3hr and 24km upstream in 4hr. Find the speed of the boat in still water and the rate of the stream.
Answers
1. 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. 10 km/hr.
C. 12.5 km/hr D. 9 km/hr
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2. A motorboat, whose speed in 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. 10 B. 6
C. 5 D. 4
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3. In one hour, a boat goes 14 km/hr along the stream and 8 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
A. 12 km/hr B. 11 km/hr
C. 10 km/hr D. 8 km/hr
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4. A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:
A. 1 km/hr. B. 2 km/hr.
C. 1.5 km/hr. D. 2.5 km/hr.
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5. A boatman goes 2 km against the current of the stream in 2 hour and goes 1 km along the current in 20 minutes. How long will it take to go 5 km in stationary water?
A. 2 hr 30 min B. 2 hr
C. 4 hr D. 1 hr 15 min