Answer:

speed=distance/time

going by this you will have to convert

15 minutes in hours to get speed in km/hr

,so 15/60 equals  1/4 hours .

Now just put the values in formula and u get the speed to be 9 divided by 1/4 which equals 36km/hr.

Step-by-step explanation:

Answer:

speed = dist. / time

speed = 20/ 1÷4 kmph

speed = 80 kmph