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  1. A man travelled a distance of 61 km in 9 hours, partly on foot at the rate of 4 km/hr and partly on bicycle at the rate of 9 km/hr. The distance travelled on foot was
    1. 12 km
    2. 16 km
    3. 20 km
    4. 24 km
Correct Option: B

Let man walked for t hours.
then, t × 4 + (9 – t) × 9 = 61
⇒  4t + 81 – 9t = 61
⇒  81 – 5t = 61
⇒  5t = 20
⇒  t = 4
∴  Distance travelled on foot
= 4 × 4 = 16 km.



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