A man completes his journey in 6 hours. He covers half the distance at 10 km/h and the rest at 20 km/h. The length of the journey is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 80 km
Let's assume the total distance is 2d.
A man completes his journey in 6 hours. He covers half the distance at 10 km/h and the rest at 20 km/h.
time = distance/speed
⇒ 6 = d /10 + d/20
⇒ 6 = 2d/20 + d/20
⇒ 6 = 3d/20
⇒ 2 = d/20
⇒ d = 40
total distance = 2d
= 2 × 40
= 80 km