| Two cars are travelling towards each other with speeds of 45 km/hr and 63 km/hr respectively. What is the distance (in kilometers) between the two cars, ten seconds before they collide?

A. 0.5

B. 0.2

C. 0.3

D. 0.45

### Right Answer is: C

#### SOLUTION

Distance travelled by them in 10 sec

[Since the cars are travelling towards each other the relative speed (s_{1} + s_{2}). ]

so, the distance covered by both cars in 10 sec

= (45+63)× (10/3600) Km

here, [1 km/hr = (1/3600) km/sec]

= 0.3 Km

Note: This is the sum of distance travelled by them in the last 10 seconds.**Formula**: Speed x Time = Distance