The speed of a motor boat in still water is 15 km/hour. If it goes down the stream
30 km and again return to the staring point in a total time of 4 hours and 30 minutes.
Find the speed of the stream.
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Answer:
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:
[A].4
[B].5 is correct
[C].6
[D].10
Step-by-step explanation:
Let the speed of the stream be x km/hr. Then,
Speed downstream = (15 + x) km/hr,
Speed upstream = (15 - x) km/hr.
=>30+30= 41(15 + x)(15 - x)2
=>900=9225 - x22
=> 9x2 = 225
=> x2 = 25
=>x = 5 km/hr.
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