Question

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. ​

Answer 1

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

Answer 2

Answer:

3 km/hr

Step-by-step explanation:

In the attached pics

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