"A car travels the first one-third of a certain distance with a speed of 10 `k m//h r`the next
Channel: Doubtnut
Date: 2020-04-05

"A car travels the first one-third of a certain distance with a speed of 10 `k m//h r`the next one-third distance with a speed of 20 `k m//h r`and the lat one-third distance with a speed of 60 `k m//h r`. The average speed of the car for the whole journey is`18 k m//h r`b. `24 k m//h r`c. `30 k m//h r`d. `36 k m//h r`"