Multiple choice

A man travels $600$ km by train at $800$ km / hr, $800$ km by ship at $40$ km/hr, $500$ km by aeroplane at $400$ km/hr and $100$ km by car at $50$ km/hr. What is the average speed for the entire distance ?

  1. $60$ km/hr
  2. $\displaystyle 60\frac{5}{123}$ km/hr
  3. $62$ km/hr
  4. $\displaystyle 83\frac{1}{3}$ km/hr
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total distance = 600 + 800 + 500 + 100 = 2000 km. Total time = 600/800 + 800/40 + 500/400 + 100/50 = 0.75 + 20 + 1.25 + 2 = 24 hours. Average speed = 2000 / 24 = 83.33 km/hr.

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