A bird files with a speed of 10 km/h and a car moves with uniforms speed of 8 km/h .both start from B towrd A (BA=40km) at the same insatnt . The bird having reached A files back immediately to meet the apporaching car. As shown as it reach the car If fiels back to A. The birds repeats this till both the car and the car and the bird reach A simultaneously .The total distancecovered by the bird is 15`psi` km. Find the value of `psi`

Options

A. 80km
B. 40km
C. 50km
D. 30km

Answer

C

Explanation

`v_(L) = 8km//h, s= v_(0) xx t rArr t= (40)/(8) = 5h`
Total distance flows by the bird `= 10 xx 5= 50km`