Two cars start at the same point and travel in opposite directions. If one car travels at 45 miles per
hour and the other at 60 miles per hour, how much time will pass before they are 210 miles apart?
(A) .5 hours (B) 1 hour (C) 1.5 hours (D) 2 hours (E) 2.5 hours
courtesy:: AAKASH BAJPAI
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2HOURS
IN 2HOURS CAR1 WITH SPEED 60MPH WILL TRAVEL 120MILES AND IN 2HOURS CAR2 WILL TRAVEL 45MILES.....SO IN 2HOURS THEY WILL BE 210MILES APART
2HOURS
IN 2HOURS CAR1 WITH SPEED 60MPH WILL TRAVEL 120MILES AND IN 2HOURS CAR2 WITH 45MPH WILL TRAVEL 90MILES.....SO IN 2HOURS THEY WILL BE 210MILES APART
Since the cars start at the same time, the time each has traveled is the same. Let t be the time when the
cars are 210 miles apart. The equation D = R × T , yields
210 = 45⋅ t + 60 ⋅ t
210 = 105⋅ t
2 = t
The answer is (D).
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