Question

a plane leaves Vancouver headed for Toronto of a speed of 700 km/hr. Half an hour later a planes leaves toronto headed to vancouver travelling at a spped of 750 km/hr. the distance between vancouver and toronto is 3420 kn. How long after the plane leaves vancouver will it pass the other plane in the air?
let the time taken by the eastbound plane until they meet be t hrs
let the time taken by the westbound plane until they meet be t-1/2 hrs

distance covered by the easbound plane = 700t
distance covered by the westbound plane = 750(t - 1/2)

700t + 750(t-1/2) = 3420
700t + 750t - 375 = 3420
1450t = 3795
t = 2.617 hrs
= appr 2 hours and 37 minutes

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