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A boat goes 30 km downstream and 18 km upstream in 6 hours, again it goes 40 downstream and 20 km upstream in 223223 hours. Find speed of boat एक नाव 6 घंटे में 30 किमी धारा की दिशा में और 18 किमी धारा की विपरीत में जाती है, फिर से 40 धारा की दिशा में और 20 किमी धारा की विपरीत में 223223 घंटे में जाती है। नाव की गति ज्ञात कीजिए
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Step-by-step explanation:
A motorboat, 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:
[A]. 4
[B].
5 @
[C]. 6
[D]. 10
Answer: Option B
Explanation:
Let the speed of the stream be x km/hr. Then,
Speed downstream = (15 + x) km/hr,
Speed upstream = (15 - x) km/hr.
30 + 30 = 4 1
(15 + x) (15 - x) 2
900 = 9
225 - x2 2
9x2 = 225
x2 = 25
x = 5 km/hr.
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