Delhi is at a distance of 200 km from Ambala. Car A set out from Ambala at a speed of `30 kmh^(-1)` and car B set out at the same time from Delhi at a speed of `20 kmh^(-1)`. When they will meet each other ? What is the distance of that meeting point from Ambala ?

Options

A. `4h` `100 km`
B. `2h` `120 km`
C. `4h` `150 km`
D. `4h` `120 km`

Answer

D

Explanation

Relative velocity, `v_(AB)=v_(A)-v_(B)=30-(-20)=50 kmh^(-1)`

They will mwwt after time t
`t=(s)/(v_(AB))=(200)/(50)=4h`
Distance from Ambala where they will meet
`x = 30xx4=120 km`