Question

Two cars start at the same time from the same location and go in the same direction. The speed of the first car is 50 km/h and the speed of the second car is 60 km/h. The number of hours it takes for the distance between the two cars to be 20 km is ______.

• A.
  1
• B.
  2
• C.
  3
• D.
  6

Answer 1

The correct option is B

2
Speed of car A = 50 km/hr
Speed of car B = 60 km/hr

Since, both cars A and B are moving in same direction, the relative speed = 60 - 50 = 10 km/hr

Distance required between them = 20 km

$\therefore \text{Time}=\frac{\text{Distance}}{\text{Speed}}=\frac{20}{10}=2hrs$