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?
Answer & explanation
Correct answer: option 1
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 .