A car can cover a distance of 144 km in 1.8 hours. In what time(in hours) will it cover double the distance when its speed is increased by 20% ?
Answer & explanation
Correct answer: option 1
Distance = Speed × Time
Speed = \(\frac{144}{1.8}\)
Speed = 80 km/h
Now , Speed is increased by 20% = 80 + 80 × \(\frac{20}{100}\)
= 80 + 16 = 96 km/h
Now ,
Time required to cover the double the distance = \(\frac{2 × 144 }{96}\)
= 3 hour
So , The required time is 3 hours