Problema Solution
A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 15.0 min at 70.0 km/h, 18.0 min at 70.0 km/h, and 50.0 min at 35.0 km/h and spends 25.0 min eating lunch and buying gas.
Determine the distance between the initial and final cities along the route.
Answer provided by our tutors
the speed = distance/time => distance = speed*time
we convert the min into hours since the speed is in km/h
15 min = 15/60 h
18 min = 18/60 h
50 min = 50/60 min
25 min = 25/60 h
d = 70*(15/60) + 70*(18/60) + 35*(50/60) + 0*(25/60)
d = 203/3 km
d = 67.67 km
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