The speed of a boat in still water is 6 km/hr and speed
of current is 4 km/hr. If time taken to cover a certain distance upstream is 10 hours, then how long will the boat take to cover the same distance downstream?
A6 hrsCorrect AnswerIncorrect Answer
B5 hrsCorrect AnswerIncorrect Answer
C2 hrsCorrect AnswerIncorrect Answer
D4 hrsCorrect AnswerIncorrect Answer
ENone of theseCorrect AnswerIncorrect Answer
Solution
Total distance = 10 × (6 – 4) = 20 km Required time = 20/(6 + 4) = 2 hrs