A boat's speed on standing water is 9 kmph, whereas the stream's speed is 1.5 kmph. A guy rows to a location 105 kilometres away and then returns to his starting position. He spent the following amount of time:
A. 16 hours
B. 18hours
C. 20hours
D. 24hours
Answer:D
A boat's speed on standing water is 9 kmph, whereas the stream's speed is 1.5 kmph. A guy rows to a location 105 kilometres away and then returns to his starting position. He spent the following amount of time:
A. 16 hours B. 18hours C. 20hours D. 24hours
Explanation: Upstream speed is 7.5 km/h.Downstream, the speed is 10.5 kmph.Total time required = 105/7.5 + 105/10.5 = 24 hours.