Traveling at 50 km/h, a person reaches his destination in a certain time. He covers 80% of his journey in \(\frac{3}{5}\)th of the time. At what speed (km/h) should he travel to cover the remaining journey so that he reaches the destination right on time?
Answer & explanation
Correct answer: option 2
Let, Distance = 500 km
Speed = 50 km/h
Time = \(\frac{500}{50}\) = 10 hours
500 × 80% = 400, remaining = 500 - 400 = 100
Remaining distance is covered in \(\frac{2}{5}\)th of time.
Speed = \(\frac{100}{\frac{2}{5} × 10}\) = \(\frac{100}{4}\) = 25 km/h