Question

A train starts form station `A` at 1pm and reaches station `B` at 3pm, after travelling 108 km. It halts at station `B` for one hour and then starts for station `C` which is 42 km from station `B`. It reaches station `C` at 7pm on the same day. The average speed of the train for the whole journey from `A` to `C` is
A. `68 km//hr`
B. `25 km//hr`
C. `30 km//hr`
D. `35 km//hr`

Answer 1

Correct Answer - B
`S=108 +42=150 km`
`t=2 +1 +3 =6hr`
`lt v gt =(150)/(6)=25 km//hr`.