Question

A Person covers half of his Journey by
train at 60 km/h, half of the remaining by bus30km/h and the rest by cycle at 10km/h Find his average speed during the entire journey.
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Answer 1

Answer:

Let total distance be d km

Distance of d 2 km is covered at 60 km/h

Time taken = (d2)60

=d120hr

Remaining distance = d2km

Distance of d2×12=d4

km is covered at 30 km/h

Time taken = (d4)30

=d120 hr

Remaining distance of d2−d4=d4

km is covered at 10 km/h

Time taken = (d4)10=d40hr

Total time taken = d120+d120+d40

= d24 hr

Average speed =

total distance

total time taken=d(d24)=24km/hr