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Distance between A and B is 72 km. Two men started walking from A and B at the same time towards each other. The person who started from A traveled uniformly with average speed of 4 km/hr. The other man traveled with varying speed as follows: In the first hour his speed 2 km/hr, in the second hour it was 2.5 km/hr, in the third hour it was 3 km/hr, and so on. When/where will they meet each other?

a) 7 hours after starting
b) 10 hours after starting
c) 35 km from AMid-way between A and B
d) 50%

Answer: d
Explanation: They covered the distance in this way together in different hours
6 + 6.5 + 7 + 7.5 + 8 + 8.5 + 9 + 9.5 + 10 = 72 Means, they’ll meet at the 9th hr.
So, In that time A will cover = 4 × 9 = 36km
They will meet in Midway

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