Question

a girl can row her boat at a speed of 5km/h in still water.if it takes 1 hour more to row the boat 5.25km upstream than to return downstream,find the speed of the stream

Answer 1

speed of stream=21 kn/hr
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Answer 2

Answer:

Answer:

Let the speed of the stream be x km/h

Speed of boat upstream =(5-x) km/h

speed of boat downstream = (5+x) km/h

Distance travelled by boat in upstream=Distance travelled by boat in downstream=5.25 Km.

ATQ:-

→ 5.25(1/(5-x)-1/(5+x)=1.

→ 5.25 (2x/(25-x^2)=1.

→ 10.5x=25-x^2=0.

→ (x^2+10.5x-25=0.

→ (x+12.5)(x-2)=0.

→ x=2 Or x= -12.5

Speed can't be negative. So speed = 2 km/h

Step-by-step explanation: