Problema Solution
C starts going 40 miles per hour (mi/h) Three hours later, D starts after C from the same point, going 60 mi/h. How long does it take D to catch up with C?
Answer provided by our tutors
v1 = 40 mph
v2 = 60 mph
t = the time D needs to catch up with C
t + 3 = the time of C
Since distance = speed*time we have:
v1(t + 3) = v2*t
40(t + 3) = 60t
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click here to see the equation solved for t
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t = 6 h
D needs 6 hours to catch up with C.