Multiple choice

Abhi finishes a journey by car in 9 hours. He travels the first half of the journey at a speed of 40 km/h and the second half of the journey at a speed of 50 km/h. The total distance covered is:

  1. 350 km

  2. 450 km

  3. 400 km

  4. 300 km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let total distance = 2d km. Time for first half = d/40 hours, second half = d/50 hours. Total time = d/40 + d/50 = d(1/40 + 1/50) = d(5/200 + 4/200) = 9d/200 = 9 hours. Solving: 9d = 1800, d = 200 km. Total distance = 2d = 400 km.

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