Question
Ratio of speed of boat in downstream and speed of stream
is 9:4, if speed of current is 8 km/hr, then find distance travelled (in km) upstream in 5 hours. Section 4Solution
Let speed of downstream and speed of stream be 9x and 4x respectively. Speed of current => 4x = 8 => x = 2 km/hr Downstream speed = 9 × 2 = 18 km/h Speed of boat = 18 - 2 = 16 km/hr Upstream speed = 16 - 2 = 14 km/h Distance travelled upstream in 5 hr = 14 × 5 = 70 km
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