Question
A boat covers a distance of 108 km downstream in 3
hours. If the ratio of upstream speed to downstream speed of the boat is 5:9, then find the distance travelled by the boat in upstream in 8 hours.Solution
ATQ, Let the upstream and downstream speed of the boat be '5x' km/hr and '9x' km/hr, respectively. ATQ, 9x = (108/3) So, 'x' = 4 So, upstream speed of the boat = 5x = 5 × 4 = 20 km/hr Required distance = 20 × 8 = 160 km
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