CAT Practice : Speed Time, Races

Increasing Speed

    Q.20: When Sourav increases his speed from 20 Km/hr to 25 Km/hr, he takes one hour less than the usual time to cover a certain distance. What is the distance usually covered by him?
    1. 125 Km
    2. 100 Km
    3. 80 Km
    4. 120 Km

 

  • Correct Answer
    Choice B. 100 Km

Detailed Solution

Here, the distance travelled by Sourav is constant in both the cases. So,
20 x t = 25 x (t-1) = D
=) 20t = 25t - 25
=) 5t = 25

=) t = 5 hrs So, Distance travelled = 20 X 5 = 100 Km.


Correct Answer: 100 Km



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"Life is a race ... if you don't run fast ... you will be like a broken undaa" - Veerusahasra Buddhi