A man travels by train at the speed of 25 km/hr and comes back by foot at the speed of 4 km/hr. If he takes total 5 hours 48 min for travel the whole journey, then find distance (in km) .
Answer & explanation
Correct answer: option 2
Speed = \(\frac{Distance}{Time}\)
1hour = 60 min
5 hour 48 min = ( 5 + \(\frac{48}{60}\) ) hr = \(\frac{29}{5}\) hr
Let distance = x km
According to question ,
\(\frac{x}{25}\) + \(\frac{x}{4}\) = \(\frac{29}{5}\) hr
\(\frac{29x}{100}\) = \(\frac{29}{5}\) hr
x = 20 km