Question

A motorboat whose speed is 15 km per hour in still water goes 30 km downstream and come back in a total time of 4 hour 30 minutes find the speed of the stream

Answer 1

Answer:

5 km/hr

Step-by-step explanation:

Let the speed of stream be x km/h

Speed downstream= (15+x)km/h

Speed upstream= (15-x)km/h

Distance= 30 km

Therefore, 30/15+x + 30/15-x =4 1/2

900/225-x²=9/2

9x²=225

x²=25

x= 5km/hr

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Answer 2

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