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A bus moves at a speed of 81 km/h. What is the speed of the bus in meters per second?

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Each of the two periods of 8 hours and 11 hours consists of two component time periods, one upstream at a speed that is the difference in boat speed and stream speed, and the other downstream at a speed that is a sum of boat speed and stream speed
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You can write, X = 81 km/h
Therefore, speed in m/s (according to our formula) = X x 5/18
= (81 x 5/18)
= 22.5 m/s

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