Question

algebra ...once again

Answer 1

Speed of boat in still water = 13 km/h

Speed of stream = 4 km/h

Speed in downstream = 13 +4 = 17 km/h

Distance to be covered = 68 km

Time = Distance / Speed

= 68 / 17

= 4 hours

Answer 2

Your answer ⬇

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Speed of boat in water still = 13km/h

Speed of stream = 4km/h

Speed on going downstream = 13 + 4 = 17km/h

Distance to be covered = 68km/h

$Time = \frac{Distance}{speed} \\ \\ \frac{68}{17} \\ \\ 4 hours$

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