Math, asked by gfor75056, 7 months ago

A boat 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:​

Answers

Answered by poorvaverma27879dpsk
1

Answer:

Speed of the stream is 5km/hr

Step-by-step explanation:

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

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