SOLUTION: How do I solve this?
"Philip drove 12 miles in town in the same time he drove 19 miles on the highway. His highway speed was 21 miles per hour faster than his speed in town. Wh
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"Philip drove 12 miles in town in the same time he drove 19 miles on the highway. His highway speed was 21 miles per hour faster than his speed in town. Wh
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Question 958678: How do I solve this?
"Philip drove 12 miles in town in the same time he drove 19 miles on the highway. His highway speed was 21 miles per hour faster than his speed in town. What was his average speed on the highway?" Found 2 solutions by josgarithmetic, MathTherapy:Answer by josgarithmetic(39799) (Show Source):
___________________speed___________time__________distance
IN TOWN_____________r________________t____________12
HIGHWAY_____________r+21_____________t____________19
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How do I solve this?
"Philip drove 12 miles in town in the same time he drove 19 miles on the highway. His highway speed was 21 miles per hour faster than his speed in town. What was his average speed on the highway?"
Let speed on highway, be S
Then speed in town = S - 21
We then get:
19(S - 21) = 12S -------- Cross-multiplying
19S - 399 = 12S
19S - 12S = 399
7S = 399
S, or speed on highway = , or mph
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