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Quantitative Aptitude Objective Questions { Boats and Streams }

1.  A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
A.2 hours
B.3 hours
C.4 hours
D.5 hours
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2. 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.10 km/hr
D.12.5 km/hr
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3.  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.2 : 1
B.3 : 2
C.8 : 3
D.None of these
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4. 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:
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5. 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:
A.3 km/hr
B.5 km/hr
C.8 km/hr
D.9 km/hr
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6. 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.4 km/hr
B.6 km/hr
C.8 km/hr
D.Data inadequate
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7. The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:
A.1.2 km
B.1.8 km
C.2.4 km
D.3.6 km
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