A student, walking at a speed of 5 km/h, took 50 minutes, but reached the school 10 minutes later than the scheduled time. To reach school on time, the speed of the student should be:
1
6.5 km/h
2
\(\frac{{25}}{6}\) km/h
3
6 km/h
4
\( \frac{{25}}{4}\) km/h