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  1. A train runs from Howrah to Bandel at an average speed of 20 km/hr and returns at an average speed of 30 km/hr. The average speed (in km/hr) of the train in the whole journey is
    1. 20
    2. 22.5
    3. 24
    4. 25
Correct Option: C

Average speed =
2xy
kmph
x + y

=
2 × 20 × 30
20 + 30

=
2 × 20 × 30
= 24 kmph
50



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