Question 11 : 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:
1. 8.5 km/hr
2. 9 km/hr
3. 10 km/hr
4. 12.5 km/hr
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Question 12 : 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?
1. 2:01
2. 3:02
3. 8:03
4. Cannot be determined
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Question 13 : 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:
1. 4
2. 5
3. 6
4. 10
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Question 14 : In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
1. 3 km/hr
2. 5 km/hr
3. 8 km/hr
4. 9 km/hr
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