A train starts from Delhi and reaches Lucknow in 24.5 hours. If it travels the first half of journey at 30 kmph and second half at 40 kmph then what is the total distance it travelled? 1) 750 km
2) 800 km
3) 840 km
4) 900 km
5) 920 km
2) 800 km
3) 840 km
4) 900 km
5) 920 km