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stellarik [79]
3 years ago
12

Adam left the science museum and traveled toward the mountains. Krystal left two hours later traveling 28 mph faster in an effor

t to catch up to him. After three hours Krystal finally caught up. Find Adam's average speed.
Social Studies
1 answer:
Semmy [17]3 years ago
4 0

Answer:

Adam's average speed is 42 mph

Explanation:

Let Adam's average speed be x

Krystal travelled 28 mph faster than Adam

Therefore, Krystal's average speed is (x + 28) mph

Krystal left 2 hours after Adam and caught up with him after 3 hours

Total time taken for Adam to travel a distance d m = 2 hours + 3 hours = 5 hours

Time taken for Krystal to travel the same distance (catch up with him) = 3 hours

Average speed = distance/time

distance = average speed × time

Since both travelled the same distance

5(x) = 3(x+28)

5x = 3x + 84

5x - 3x = 84

2x = 84

x = 84/2 = 42 mph

Adam's average speed is 42 mph

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