A motor car moves at a speed of 72 km/h and 54 km/h after and before repairing respectively. It covers X distance in 6 hours after repairing. How much time(in hours) will it take to cover 5X distance before repairing?

40

Speed before repairing = 54 km/h

Speed after repairing = 72 km/h

Distance x is covered after repairing in x hours ,

Distance = Speed × Time

x = 72 × 6 = 432 km

x = 432 km

5x = 5 × 432 = 2160 km

Time taken to cover 5x distance with 54 km/h ,

Time = \(\frac{2160}{54}\)

= 40 hours

So , Time taken to cover 5x distance is 40 hours .