1st hour = 21km/hr 2nd hour = 23km/hr 3rd hour = 28km/hr 4th hour = 40km/hr find the average speed
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Step-by-step explanation:
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/hrB. 10 km/hr.C. 12.5 km/hrD. 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. 10B. 6C. 5D. 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/hrB. 11 km/hrC. 10 km/hrD. 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 minB. 2 hrC. 4 hrD. 1 hr 15 min