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Question
If two planes leave the same airport at 1:00 pm, how many km apart will they at 3:00 one traverls directly at 150 km/h and the other travels directly west at 200 km/h?
50 km
500 km
4000 km
600 km
ANSWER : 2
Descrption
<p>Difference of time = 3:00 pm 1:00 pm = 2 hrs</p> <p>First plane travels in 2 hrs = 2×150 = 300 km</p> <p>Second plane travels in 2 hrs = 2×200 = 400 km</p> <p>The directions of the planes forms a right angle triangle</p> <p>So, the direct distance = √(3002 + 4002) = √250000 = 500</p> <p>km</p>
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