The speed of the boat in still water is 30 km/hr. It goes 75 km downstream and comes back in 9 hours. Find the speed of the current. ?
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Let the speed of the current = 'x' km/hr
We have 75/(30+x) + 75/(30-x) = 9
⇒ 75(60/(900-x^2)) = 9
⇒ 900-x^2 = 500
⇒ x^2 = 400
⇒ x = 20km/hr
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Answer:
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Step-by-step explanation:
=> Let the speed of the current = 'x' km/hr
=> We have 75/(30+x) + 75/(30-x) = 9
⇒ 75(60/(900-x^2)) = 9
⇒ 900-x^2 = 500
⇒ x^2 = 400
⇒ x = 20km/hr
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