Question
The speed of a boat in still water is 8 km/hr and speed
of current is 4 km/hr. If time taken to cover a certain distance upstream is 12 hours, then how long will the boat take to cover the same distance downstream?Solution
Total distance = 12 × (8 – 4) = 48 km Required time = 48/(8 + 4) = 4 hrs
If a bus travel 20 km in 15 minute then how much time take if speed is decrease by 20 km/h?
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