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Speed, Time and Distance

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  1. A motorist travels to a place 150 km away at an average speed of 50 km/hr and returns at 30 km/hr. His average speed for the whole journey in km/hr is
    1. 37.5
    2. 37
    3. 35
    4. 40
Correct Option: A

Average speed of whole journey =
2xy
kmph
x + y

=
2 × 50 × 30
 kmph
50 + 30

=
2 × 50 × 30
 = 37.5 kmph
80


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