Question
A launch covers 225 km in downstream in 5 hours. If the
upstream speed is one-third of the downstream speed, find the time needed to travel 150 km upstream.Solution
ATQ,
Downstream speed of the launch = 225 / 5 = 45 km/h
Therefore, upstream speed of the launch = 45 / 3 = 15 km/h
Required time taken = 150 / 15 = 10 hours
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