An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in $1 \frac{2}{3}$ hours, it must travel at a speed of:

300 kmph

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360 kmph

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600 kmph

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720 kmph

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Solution

The correct option is C 720 kmph
Distance = (240 $\times$ 5) = 1200 km.
Speed = Distance/Time
Speed = 1200/(5/3) km/hr. [We can write $1 \frac{2}{3}$ hours as 5/3 hours]
$∴$ Required speed = $(1200 \times \frac{3}{5})$ km/hr=720 km/hr.

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An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 123 hours, it must travel at a speed of:

The correct option is C 720 kmphDistance = (240 × 5) = 1200 km.Speed = Distance/TimeSpeed = 1200/(5/3) km/hr. [We can write 123 hours as 5/3 hours]∴ Required speed = (1200×35) km/hr=720 km/hr.

An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in $1 \frac{2}{3}$ hours, it must travel at a speed of:

The correct option is C 720 kmph
Distance = (240 $\times$ 5) = 1200 km.
Speed = Distance/Time
Speed = 1200/(5/3) km/hr. [We can write $1 \frac{2}{3}$ hours as 5/3 hours]
$∴$ Required speed = $(1200 \times \frac{3}{5})$ km/hr=720 km/hr.