Asked by Joe
Sam drove for 2 hours at 45mph. He has the same distance remaining. How fast should he drive to make his average speed 60mph.
Answers
Answered by
mathhelper
distance covered in first leg = 2(45) or 90 km
so total distance = 180 km
wants to average 60 mph
total time = 180/60 = 3
so he must cover the last 90 km in 1 hour or his speed must be 90 kmh.
so total distance = 180 km
wants to average 60 mph
total time = 180/60 = 3
so he must cover the last 90 km in 1 hour or his speed must be 90 kmh.
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