Two planes start at 11AM from two airports 1800 miles apart, and fly toward each other at average rates of 200 and 250 miles per hour. the time at which they pass each other will be?

Question

Two planes start at 11AM from two airports 1800 miles apart, and fly toward each other at average rates of 200 and 250 miles per hour. the time at which they pass each other will be?
(A)4:30 PM
(B)2:30 PM
(C)2 PM
(D)3 PM

chloe · Accepted Answer

d 3pm. the guy (unowen) above me did it correctly but forgot that it was asking for the time the planes met. 4 hours added onto 11 am is 3pm, thus answer choice d

unowen · Answer

Let n be the time between the planes leaving and then meeting each other. Then 200n+250n=1800 450n=1800 n=4 hours ☺☺☺☺