Two Planes Leave At The Same Time. One Flies West At 300 Km Per Hour….

Two planes leave at the same time. One flies west at 300 km per hour. The other flies east at 450 km per hour. In how many hours will they be 2,250 kilometers apart?

First, They are opposite directions, so

To get their distance (1st hour),

Add 300 + 450 = 750

Then, 2250 / 750 = 3 hours

The planes leave the same origin at the same time towards opposite directions. Therefore, their distance apart is increasing.

Distance = Rate × Time

Distance apart: 2,250

Rate: (450 + 300) km/hour

Time travelled when the distance apart is 2,2,50 kms: ?

2,250 km = (300 + 450)km/h  ×  Time

Time = 2,250 km ÷ 750 km/h

Time = 3 hours

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