1) A cyclist moves a distance of 2000 meters during a time of 20 minutes. How fast is the cyclist? 2) A car moves for 20 minutes on a road with constant speed. If he traveled 60 kilometers, what is his speed?

1)  speed of a cyclist = 100 m/min.

2) speed of a car moving = 3 km/min.

Explanation:

1)  speed of a cyclist = distance over time

                                  = 2000 m / 20 min

                                  = 100 m/min.

2) speed of car moving = distance over time

                                       = 60 km / 20 min

                                        = 3 km/min.

a.   mass number from atomic number