A swimmer completes three lengths of a 25 m swimming pool in 50 s.
What is the average speed of the swimmer?
0.50 m/s0.50\ \mathrm{m/s}0.50 m/s
0.67 m/s0.67\ \mathrm{m/s}0.67 m/s
2.0 m/s2.0\ \mathrm{m/s}2.0 m/s
1.5 m/s1.5\ \mathrm{m/s}1.5 m/s