Ratio of speed of boat in downstream and speed of stream is 7:3, if speed of current is 9 km/hr, then find distance travelled (in km) upstream in 6 hours.
Let speed of downstream and speed of stream be 7x and 3x respectively. Speed of current => 3x = 9 => x = 3 km/hr Downstream speed = 7 × 3 = 21 km/h Speed of boat = 21 - 3 = 18 km/hr Upstream speed = 18 - 3 = 15 km/h Distance travelled upstream in 6 hr = 15 × 6 = 90 km
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