The correct option is C Bike
Distance covered by car in 1 hour = 40 km
Distance covered by car in 3 hour
= 40 + 40 + 40 = 120 km
Distance covered by truck in 1 hour
= 30 km
Distance covered by truck in 3 hour
= 30 + 30 + 30 = 90 km
Distance covered by bike in 1 hour
= 50 km
Distance covered by bike in 3 hour
= 50 + 50 + 50 = 150 km
Bike covered most distance in 3 hour.
So, more the speed more the distance covered in a given time.