Question
The speed of a boat in still water is 7 km/hr and speed
of current is 3 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?Solution
Total distance = 10 × (7 – 3) = 40 km Required time = 40/(7 + 3) = 4 hrs
The least number which when divided by 6, 7, 10, 13, and 15 leaves the same remainder 5 in each case, is:
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