SOLUTION: Two trucks are driving to the same place. The first truck starts 50 miles ahead of the second truck and travels at an average speed of 60 miles per hour. The second truck travels a

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Question 892587: Two trucks are driving to the same place. The first truck starts 50 miles ahead of the second truck and travels at an average speed of 60 miles per hour. The second truck travels at an average speed of 70 miles per hour. Which graph represents this situation and shows the number of hours it will take for the second truck to pass the first truck?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Both travel for assumed same time, t. Slow truck travels less distance than the fast truck.

____________________rate______time______distance
SLOW________________60_________t________d-50
FAST________________70_________t_________d

Both times are equal.
highlight_green%28%28d-50%29%2F60=d%2F70%29 based on T=D/R.

70%28d-50%29=d%2A60
7%28d-50%29=6d
7d-350=6d
d=350

Find t.
t=d%2FR
t=350%2F70
highlight%28t=5%29