Anuj started his journey and first ‘D’ km cover with speed 48 km/h and next ‘D + 6’ km with speed 24 km/h and remaining ‘D + 18’ km with speed 60 km/h. If the average speed of his journey is 40 km/h, then what is the time taken by Anuj to cover ‘2D + 6’ km with his average speed?
1
50 minutes
2
60 minutes
3
40 minutes
4
45 minutes