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Trains Boats and Streams Practice Test 3 with solutions
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© examsnet.com
Question : 14
Total: 40
The rate at which a river flows is one-third of the speed of the boat in still water. If the boat travels down the river for 2 hours and then backup river for 2 hours, it will be 16 km short of its starting point. The speed (km/hr) of the boat in the still water is:
4
6
8
12
Validate
Solution:
Let the speed of the boat = 3x km/hour
The speed of the current = x km/hour
Speed downstream = 4x
Speed upstream = 2x
According to the question,
(4x) × 2 - 16 = (2x) × 2
8x - 16 = 4x
4x = 16
x = 4
So, the speed of the boat = 4 × 3 = 12 km/hour
© examsnet.com
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