John took a bus from home to market, that travels at 50 kmph. While walking back at 5 kmph,
halfway through, he suddenly realized he was getting late and he cycled back the remaining distance in 35 kmph. Find the average speed.	Choose the correct choice from the following.
A) 8.5 kmph B) 16.0 kmph C) 22.5 kmph D) 18.6 kmph E) none of these
Let the distance be 2x(one way)   Time taken by bus = 2x/50, by walking =x/5, by cycling = x/35 hours   :. Average speed = Total 18.6 kmphistance/Total time   = 5x / x/25 + x/5 + x/35   = 5 *60 / 2.4+12+1.7   = 18.6   ANSWER:18.6 kmph
<result>D</result>
John took a bus from home to market, that travels at 50 kmph. While walking back at 5 kmph,
halfway through, he suddenly realized he was getting late and he cycled back the remaining distance in 35 kmph. Find the average speed.