Problema Solution
A bus traveled 387 km in 5h. One hour of the trip was in city traffic. Thebus's city speed was just half of its speed on open highway. The rest of the trip was on open highway. Find the bus's city speed.
Answer provided by our tutors
1 h in city traffic at speed X, so 4 h in highway traffic at speed Y
since distance = rate x time,
387 = 5(x + 4y)
And x = 1/2 y, so now we can substitute
387 = 1/2 y + 4y
387 = 4.5 y
y = 86 km/h
so x = 1/2 y, so
x = 43 km/h