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Trains Boats and Streams Practice Test 3 with solutions
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© examsnet.com
Question : 4
Total: 40
The current of a river runs at 1 km/hr. A motorboat goes 35 km upstream and back again to the starting point in 12 hours. The speed of the motorboat in the still water is:
9 km/hr
8 km/hr
7 km/hr
6 km/hr
Validate
Solution:
Let x km/hr be the speed of the motorboat in still water, then,
35
x
−
1
+
35
x
+
1
= 12
⇒
35
x
x
2
−
1
= 6
⇒
6
x
2
- 35x - 6 = 0
⇒ (6x + 1) (x – 6) = 0
Hence, x = 6 km/hr.
© examsnet.com
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