Amit covers a certain distance on his bike at a speed of 40 km/h in 15 min. If he wants to cover the same distance in 12 min, then what should his speed be?

A

$$60\frac{km}{h}$$

B

$$50\frac{km}{h}$$

C

$$72\frac{km}{h}$$

D

$$32\frac{km}{h}$$