I say this really depends on the kid some kids learn quick and are taught at a early age while for some struggle and take more time into learning how to ride a bicycle.
Riding a bike is a lot of fun and great exercise for kids. Learning to ride a two-wheeled bicycle without training wheels is also an important milestone. Children usually learn to ride a bike sometime between the ages of 3 and 8, with an average of just over age 5.
The first person has to travel 200m at 2 m/s. It will take him 200/2=100 seconds to reach the gate. The second person is moving towards the gate at 2 + 3 meters per second so it will take her 200/5 = 40 seconds to reach the gate. Therefore, person #1 needs an extra 100-40 = 60 seconds.
