Amar uses a Maruti Van and Anthony a Racing Car from Mumbai to Pune. Maruti Van has a speed of 120 km per hour and the Racing Car of 210 km per hour. After driving for 12 minutes, what will be the difference of distance between the two?

Options

A. 20 km
B. 18 km
C. 15 km
D. 16 km

Answer

A

Explanation

Amar travelled `=(120)/(60)xx12`
=24 km in 12 minutes
Anthony travelled
`=(210)/(60)xx12=42` km in 12 minutes
`:.` Difference of distance `=42-24=18` km
Trick :
Required difference of distance =difference in speeds x time
`=90xx(12)/(60)=18` km