The distance between two places A and B is 245 km. TWo cars, one from A and the other from B, start at the same time, travelling towards each other. If one car travels at a speed of 40 km/h and the other at 30 km/h , after how many hours will they meet?

The distance between two places A and B is 245 km. TWo cars, one from A and the other from B, start at the same time, travelling towards each other. One car travels at a speed of 40 km/h and the other at 30 km/h.

$$Time = \frac{Total  distance  between  them}{Relative  Speed}$$

$$=\frac{245}{30+40}$$ (+ done because both are travelling towards each other)

$$=\frac{245}{70}$$

$$=\frac{7}{2} = 3\frac{1}{2}$$

Option C is correct.