Multiple choice

A boy travels from Kohara to Jalandhar at a speed of 80 km/hr. On the return journey, he decreases his speed by 25%. If the distance between Kohara and Jalandhar is 60 km, find the extra time taken by the boy during his return journey.

  1. 10 min

  2. 12 min

  3. 18 min

  4. 15 min

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Outward speed = 80 km/hr. Outward time = 60/80 = 0.75 hours (45 min). Return speed = 80 - 25% of 80 = 60 km/hr. Return time = 60/60 = 1 hour (60 min). Extra time = 60 - 45 = 15 min.

AI explanation

A 25% decrease on 80 km/hr means the return speed is 60 km/hr. The time taken for the onward journey is 60 km divided by 80 km/hr, which equals 0.75 hours. The time for the return journey is 60 km divided by 60 km/hr, which equals 1 hour. The difference between the two times is 0.25 hours, which equals 15 min.

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