Question

17. A car travels from point A to B in 3 hours and returns back to point A in 5 hours. Points A and B are 150 km apart along a straight highway. What is the average speed of the car? *
a) 37.5 km/h
b) 65.5 km/h
c) 85.5 km/h
d) 120 km/h

Answer 1

Answer:

Points A and B are 150 km apart. Cars 1 and 2 travel from A to B, but car 2 starts from A when car 1 is already 20 km away from A. Each car travels at a speed of 100 kmph for the first 50 km, at 50 kmph for the next 50 km, and at 25 kmph for the last 50 km. What is the distance, in km, between car 2 and B when car 1 reaches B ?

A. 3

B. 4

C. 5

D. 6

E. 7