Question

a bus travels 280 km south along a straight path with an avg velocity of 88 km/h to the south. then it travels 210 km south with an avg velocity of 75 km/h to the south.
a) how long does the 1st trip last?
b) how long does the 2nd trip last?
c) what is the avg velocity for the total trip?

Answer 1

t1 = 280/88
t2 = 210/75

all south so
v average south = (280+210)/(t1+t2)