Question
An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1 hours, it must travel at a speed of:
Answer: Option D
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Distance = (240 x 5) = 1200 km.
Speed = Distance/Time
Speed = \(\frac{1200}{(5/3)}km/hr. \left[We can write1^{\frac{2}{3}}hours as 5/3 hours\right]\)
Therefore Required speed = \(\left(1200\times\frac{3}{5}\right)km/hr = 720km/hr.\)
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