Question
A boat sails 150 km in downstream direction in 5 hours.
If the upstream speed is one-third of its downstream speed, calculate the time it will take to cover 90 km against the current.Solution
ATQ,
Downstream speed of the boat = 150 / 5 = 30 km/h
Therefore, upstream speed of the boat = 30 / 3 = 10 km/h
Required time taken = 90 / 10 = 9 hours
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