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To calculate Marta's speed in metres per second, we divide the distance by the time:
Speed = Distance / Time
Speed = 100m / 20s
Speed = 5m/s
Therefore, Marta's speed is 5 metres per second.
To calculate how far Marta can run in 4 minutes (240 seconds) at the same speed, we multiply the speed by the time:
Distance = Speed x Time
Distance = 5m/s x 240s
Distance = 1200m
Marta can run 1200m in 4 minutes at the same speed.
To calculate how long it would take Marta to run 2000m at the same speed, we divide the distance by the speed:
Time = Distance / Speed
Time = 2000m / 5m/s
Time = 400s
It would take Marta 400 seconds to run 2000m at the same speed.