Problema Solution
a courier travels to and from a manufacturing plant in 7 hours. his average speed to the plant is 80km/h, and the return trip averages 20km/h slower. how long did it take to reach the plant?
Answer provided by our tutors
let
t = the time of the travel to the plant
7 - t = the time of the travel from the plant
v1 = 80 km/h the average speed to the plant
v2 = 80 - 20 = 60 km/h the average speed of the return trip
since distance = speed*time we have:
v1t = v2(7 - t)
80t = 60(7 - t)
by solving we find:
t = 3 hr
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it takes 3 hours to reach the plant.