Multiple choice

Two men start walking from A & B, at a distance of 63 km towards each other at same time. The speed of first person is 4 km/h, while the other one starts at 2 km/h and increases his speed every hour by 1 km/h, then after what duration will they meet?

  1. 7 hours

  2. 9 hours

  3. 5 hours

  4. 6 hours
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

After 7 hours, first person travels 28 km (4 × 7). Second person travels 1+2+3+4+5+6+7 = 35 km (sum of first 7 natural numbers, starting at 2 km/h). Total = 63 km, exactly the initial distance. At 6 hours, they'd only travel 24 + 21 = 45 km, which is less than 63 km.

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