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A motar boat whose speed is …

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A motar boat whose speed is 15km per hr in still water goes 30km downstream and comeback in a total time of 4hr 30min . Find the speed of the stream?

Posted by Vikas Jha 6 years ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years ago

Let the speed of the stream be x km/hr
Then,
Speed downstream = (15 + x) km/hr
Speed upstream = (15 - x) km/hr

∴ 30/(15+x) + 30/ (15−x) = 4 1/2
⇒ 900/(225−x²) =9/ 2
⇒ 9x² = 225
⇒x²= 25
⇒x = 5km/hr

3Thank You

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