A runner wants to complete a 1.2 km race in 4.0 minutes. She completes the first 600 m in 150 s.
What average speed does she need for the remaining distance?
2.5 m/s2.5\ \mathrm{m/s}2.5 m/s
4.0 m/s4.0\ \mathrm{m/s}4.0 m/s
5.0 m/s5.0\ \mathrm{m/s}5.0 m/s
6.7 m/s6.7\ \mathrm{m/s}6.7 m/s