SOLUTION: Chris and Goffy ran from Newton to Boston at 15km/h and 12 km/h respectively. They both started from Newton at 10 am. If Goffy reached Boston at 10:30 am, what time did Chris Bosto

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Question 979872: Chris and Goffy ran from Newton to Boston at 15km/h and 12 km/h respectively. They both started from Newton at 10 am. If Goffy reached Boston at 10:30 am, what time did Chris Boston?
** Please, can u show all the steps, not only the answer. Thxs!
Answer by josgarithmetic(39799) About Me  (Show Source):
You can put this solution on YOUR website!
RT=D uniform rates rule for travel relates rate time and distance.

________________rate___________time___________distance
Chris___________15_____________1/2-t___________d
Goffy___________12_____________1/2_____________d

The tabulated information needs some thought. Both left at same point in time. Chris going faster arrives before Goffy, and Chris required some unknown LESS time t than did Goffy.

Find d using Goffy's data.
12%281%2F2%29=d
d=6-------------d is now known.

Find t using Chris's data.
.
.
Can you do this?