Question

A car travels totally a distance of ‘D’ at different speeds in the same direction as follows: 0 to D/3 at 10 kmph, D/3 to 2D/3 at 20 kmph, 2D/3 to D at 30 kmph. The average speed of the car is​

Answer 1

10003 Km/hr is the answer

Answer 2

Answer:

180/11

Step-by-step explanation:

speed = distance/time ==> time=distance/speed

for first d/3 kms time taken is D/30kmph

for next d/3 kms time taken is D/60kmph

for last d/3 kms time taken is D/90kmph

avg.speed = total distance/total time

==> D/(D/30+D/60+D/90)

= 180/11 kmph