Question

9. A race-boat covers a dist
covers this distance
ors a distance of 60 km downstream one and a tour
be distance upstream in 2 hours. The sound of the actor in s
water is 35 km/hr. Find the speed of the stream​

Answer 1

Answer:

Let The Speed Of Stream Be x km/hr.

Now Speed Upstream = 35-x

Speed Downstream = 35+x

Now Time = Distance/Speed

3/2 = 60/35+x

And

2 = 60/35-x

Cross Multiplying We Get

105+3x = 120

3x = 15

x = 5

Check By Solving Other Equation

2 = 60/35-x

70-2x = 60

2x = 10

x = 5

So

Speed Of Stream = 5km/hr

Step-by-step explanation:

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Answer 2

Let speed of stream= x kmph

Speed upstream= (35+x) kmph

time = 2hours

distance = 2×(35-x) = 70-2x km

According to question

distance= 60km

70-2x = 60

2x = 70 - 60

x = 10/2

x = 5 kmph

Speed of stream is 5 km/h.

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