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Trains Boats and Streams Practice Test 1 with solutions
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© examsnet.com
Question : 19
Total: 40
A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 miles/hr, find the speed of the stream.
4 miles/hr
3 miles/hr
2.5 miles/hr
2 miles/hr
Validate
Solution:
👈: Video Solution
Let speed of the stream be x miles/hr, then
36
10
−
x
−
36
10
+
x
=
90
60
⇒
48
x
100
−
x
2
= 1
⇒
x
2
+ 48x - 100 = 0
⇒ (x – 2) (x + 50) = 0
∴ x = 2 miles/hr.
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