Problema Solution
Bert is 13 kilometers away from Brenda. Both begin to walk toward each other at the same tim. Bert walks 4 kilometers per hour. They meet in 2 hours. How fast is Brenda walking?
Answer provided by our tutors
let
v1 = 4 km/h the speed of Bert
v2 = the speed of Brenda
d = 13 km the distance between them
t = 2 hours the time that they wal
since speed = distance/time => distance = speed*time
the distance that Bert walked + the distance that Brenda walked = the total distance of 13 km
v1*t + v2*t = 13
4*2 + 2*v2 = 13
by solving we find
v2 = 2.5 km/h
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Brenda is walking with speed of 1.2 kilometers per hour.