Find the total distance covered by the boat in upstream and downstream in 7 hours if the speed of the boat in still water and the speed of the current are 21 km/h and 3 km/h respectively.

280 km
294 km
315 km
301 km

Correct answer: 294 km

Solution

Speed upstream = 21 - 3 = 18 km/h and speed downstream = 21 + 3 = 24 km/h. If the boat travels upstream and downstream for 7 hours in total with equal time split, the average effective speed is 21 km/h, giving total distance 21 7 = 294 km.

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