Numerical - Velocity & distance

Q.  Two cars X and Y move on adjacent roads in opposite directions. If velocity of car X and Y is 80 km/hr and 60 km/hr respectively, then what will be the relative velocity of car X w.r.t. Y?
- Published on 18 Sep 15

a. 70 km/hr
b. 100 km/hr
c. 140 km/hr
d. Insufficient data

ANSWER: 140 km/hr

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    Discussion

  • Sravanthi   -Posted on 15 Dec 15
    Given: Velocity of car X = 80 km/hr, velocity of car Y = 60 km/hr

    Solution:

    The relative velocity of car X w.r.t. Y can be calculated by determining the difference between the velocities of car X and Y

    Therefore,

    velocity of car X w.r.t. Y = V(X/Y) = V(X) – V(Y)

    = 80 - (-60) ------ (Two cars travel in opposite direction)

    = 140 km/hr

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