How much time does a bus take to reach its destination 400 km away, if it covers half of its journey at a speed of 50 km/hr, 60% of the remaining journey at 60 km/hr. and the remaining at 80 km/hr?

How much time does a bus take to reach its destination 400 km away, if it covers half of its journey at a speed of 50 km/hr, 60% of the remaining journey at 60 km/hr. and the remaining at 80 km/hr?
1). 5 hrs
2). 6 hrs
3). 7 hrs
4). 8 hrs

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