Problema Solution
A pickup truck is driven 280mi. If it had traveled 5mph faster, it could have made the trip in 1 hour less time. What was the speed of the truck?
Answer provided by our tutors
Let
v = the speed of the truck, v>00
v + 5 = the new speed
d = 280 mi
Since speed = distance/time follows time = distance/speed:
280/v = 1 + 280/(v + 5)
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click here to see the equation solved for v
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v = 35 mph
We need to ignore the negative solution -40 because the speed of the truck can only be positive.
The speed of the truck was 35 mph.