Question 155: An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1hours, it must travel at a speed of:

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Distance = (240 x 5) = 1200 km.Speed = Distance/TimeSpeed = 1200/(5/3) km/hr.     [We can write 1hours as 5/3 hours]Required speed =1200 x3km/hr= 720 km/hr.5