Question

6 A car covers first 100 km of his journey at 50 km/h, next 50 km at 40 km/h and last 75 km in 5/4 hours Find the average speed of the whole journey.

Please answer the question no.5

Answer 1

Answer:

total distance = 100+50+75

215km

total speed = 50+40+5/4

65km/h

Answer 2

Answer:

time=loo/50 = 2 hrs

..... = 50/40=11/4hrs

speed

=75 / (5/4) = 75x4/5=60km/r

Total distance =225 km

hrs taken=4 1/2

Average speed=225/4.5=50km/hr