Multiple choice

A man completed certain journey by train. He travels 40% of the distance at an average speed by 300km/hr. 25% of the distance by 400 km/hr. and rest at an speed of 350 km/hr. find the his average speed during entire journey? (up to nearest integer)

  1. 392 km/hr.

  2. 364 km/hr.

  3. 338 km/hr.

  4. 362 km/hr.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average speed = total distance / total time. Let total distance = 100 km. Time for each part: 40/300 + 25/400 + 35/350 = 0.1333 + 0.0625 + 0.1 = 0.2958 hrs. Speed = 100/0.2958 ≈ 338 km/hr.