<br />(1) If the speed of an aeroplane is decreased by 120 km/h, it takes 18 minutes more<br />to travel some distance. If the speed is increased by 180 km/h, it takes 18 minutes<br />less to travel the same distance. Find the average speed of the aeroplane and the<br />distance.
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Answer:
Distance covered =. xy = 720*90/60
= 360*3 = 1080 km
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