Multiple choice

A car travels a certain distance at an average speed of 60 km/hr. On the return journey along the same route, the car faces traffic and can only travel at an average speed of 40 km/hr. If the total travel time for the round trip is 6 hours, what is the distance of the route?

  1. 120 km

  2. 124 km

  3. 144 km

  4. 160 km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let d be the one-way distance. Total time = d/60 + d/40 = 6. Multiplying by 120 gives 2d + 3d = 720, so 5d = 720, d = 144 km.

AI explanation

Using the formula for average speed over equal distances, the average speed for the round trip is (2 × 60 × 40) / (60 + 40) = 48 km/hr. The total travel time is 6 hours, so the total distance for the round trip is 48 × 6 = 288 km. The distance of the single route is half of this, which is 144 km.

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