a motor boat whose speed is 15 kmph in still water goes 36 km upstream and comes back to the starting point in 5hrs. find the speed of the stream.
Answers
Answered by
2
Answer:
Let the speed of the stream be x km/hr
Then Speed of boat downstream =(15+x) km/hr
Speed of boat upstream =(15−x) km/hr
Therefore,
15+x
30
+
15−x
30
=4
2
1
=
2
9
⇒
(15+x)(15−x)
30(15−x)+30(15+x)
=
2
9
⇒
225−x
2
900
=
2
9
⇒200=225−x
2
⇒x
2
=25
⇒x=5 km/hr
Answered by
2
Answer:
3 km/hr
Step-by-step explanation:
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