Q. 355.0( 9 Votes )

The speed of a boat in still water is 15 km/h. It can go 30 km upstream and return downstream to the original point in 4 hours and 30 minutes. Find the speed of the stream.

Answer :

Let the speed of the boat be ‘X’ km/ hr, time taken for upstream and downstream be T1 hrs & T2 hrs respectively.

––––––– (i) (Downstream)

––––––– (ii) (Upstream)

Adding equation equation (i) & equation (ii),

2025 – 9X2 = 1800

9X2 = 225

X2 = 25

X = ±5

speed can’t be negative.

The speed of the stream be 5 Km/hr

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