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December 21, 2014

December 21, 2014

Posted by **Jordan** on Monday, February 7, 2011 at 7:35am.

what is the total travelling time and what is the total distance travelled??

thanks

- physics -
**drwls**, Monday, February 7, 2011 at 10:30amLet D = distance traveled (km)

T = total time of trip in hours

90 (T-0.5) = D

D = 78 T

Two equations, two unknowns.

Solve by substitutuion.

90(T - 0.5) = 78 T

12 T = 45

T = 3.75 hours (3.25 of which was driving)

D = 292.5 km

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