please send me answer of questions no 11

Asked by 0 Mili_28😉😁🤗 | 19th Nov, 2020, 09:08: PM

Expert Answer:

Let the speed of the stream be x km/h.
Here the speed of water is 3 km/h 
Speed downstream will be = (x + 3) km/h
Speed upstream will be = (x − 3) km/h
Time taken in downstream is 15 hours and
Time taken in upstream is 20 hours
Now, distance downstream = distance upstream⇒
15(x + 3) = 20(x − 3)
⇒ 15x + 45 = 20x − 60
⇒ 15x − 20x = −60 − 45
⇒ −5x = −105 or x = 21 km/h
Therefore, speed downstream = 21 + 3 = 24 km/h
As Distance downstream and upstream are both same. We can calculate the distance by using any of the cases.
So, distance between the two towns = Downstream speed × Time taken in downstream = 24 × 15 = 360 km

Answered by  | 26th Nov, 2020, 08:32: PM

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