Question

a car covers the first half of the distance between two places at a speed of 40km/h and the second half at 60km/h. what is the average speed of the car​

Answer 1

Answer:

(40km+60km)÷2hr=50 km/h

Answer 2

Letx consider, x= total distance covered by the car,

Time taken to complete the half distance with velocity v=40km/h,t 1 = 2×40x = 80x . . . .(1)

The time taken to complete another half distance with velocity u=60km/ht = 2×60x = 120 hr

The total time taken, t=t 1 +t 2

t= 80x + 120x

= 48x hr

The average speed of the car,

v aavg = x/48x

=48km/h