An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. to cover the same distance in 1 ⅔ hours, it must travel at a speed of:
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240 kmph ~ 5 hours
x kmph ~ 1 2/3 hours = 5/3 hours
240/x = (5/3)/5
5/3x = 5 × 240
5/3x = 1200
x = 1200 : 5/3
x = 1200 × 3/5
x = 720 kmph
x kmph ~ 1 2/3 hours = 5/3 hours
240/x = (5/3)/5
5/3x = 5 × 240
5/3x = 1200
x = 1200 : 5/3
x = 1200 × 3/5
x = 720 kmph
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