A boy travelled from the home to the college at the rate of 35 km/h and walked back at the rate of 3 km/h. If the whole journey took 6 h 30 min, then the distance of the college from the home (correct to 2 decimal places) is:
1
18.01 km
2
17.58 km
3
17.25 km
4
17.96 km