Question 712079
speed = distance/time
70=dab/1.5 (distance from a to b devided by an hour and a half)
Dab = 105km
Dbc = 55km
Sab = 70 (speed from a to b)
Total speed average = 80
Total distance = 160
Let x = total time
80 = 160/x
x = 2
speed = distance/time
SBC = 55/0.5
SBC = 110kmph