A person takes 40 minutes more than his usual time when he covers a distance of 20 km at 5 km/h. If he covers the same distance at 8 km/h, he takes x minutes less than the usual time. What is the value of x?
Answer & explanation
Correct answer: option 2
Distance = Speed × Time
Time = \(\frac{Distance }{Speed}\)
= \(\frac{20 }{5}\) = 4 hours
As , time of 4 hours is 40 minute more than usual time .
So , Usual time is 3 hours 20minutes
Now ,
If Speed is 8 km/h
Time = \(\frac{20 }{8}\) = 2 hours 30 minutes
Difference in time = 3 hours 20minutes - 2 hours 30 minutes = 50 minutes