$A$ and $B$ start from Opladen and Cologne respectively at the same time and travel towards each other at constant

$A$ and $B$ start from Opladen and Cologne respectively at the same time and travel towards each other at constant speeds along the same route. After meeting at a point between Opladen and Cologne, $A$ and $B$ proceed to their destinations of Cologne and Opladen respectively. $A$ reaches Cologne $40$ minutes after the two meet and $B$ reaches Opladen $90$ minutes after their meeting. How long did $A$ take to cover the distance between Opladen and Cologne?

(A) 1 hour
(B) 1 hour 10 minutes
(C) 2 hours 30 minutes
(D) 1 hour 40 minutes
(E) 2 hours 10 minutes

Answer: D

Source: Veritas Prep

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