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Total distance covered by the car in 12 hours = 65 x 12 = 780 km Time taken by the car in the return journey = 0.80 x 12 = 9.6 hours Average speed = Total distance covered ÷ Total time taken Average speed of the car = (780 x 2) ÷ (12 + 9.6) ~ 72.2 km/h
A boat takes 3 hours to travel 24 km downstream and 4 hours to travel 16 km upstream. What is the speed of the current?
A boat can cover 130 km in downstream in 10 hours and 120 km in upstream in 8 hours. Find the speed of boat in still water
A man row a boat 1 km in 5 min, along the stream and 6 km in 1hrs against the stream, The speed of the stream will be