Car P covered 30 km in 20 minutes, Car Q covered 42 km in 35 minutes, whereas car R covered 40 km in half an hour. Which car(s) have the maximum speed ?

P

Car P covered 30 km in 20 minutes

In 60 min it will cover = 90km

Car Q covered 42 km in 35 minutes

In 60 min it will cover = 72km

R covered 40 km in half an hour

In 60 min it will cover = 80km

P car has the maximum speed.