Brodie and Ryan are driving directly towards each other. Brodie is driving at a constant speed of 50\:km/h. Ryan is driving at a constant speed of 40\:km/h. If they are 120\:km apart, how long will it take before they meet?
Answer Choices
A. 1\:hr\:12\:min
B. 1\:hr\:25\:min
C. 1\:hr\:15\:min
D. 1\:hr\:33\:min
E. 1\:hr\:20\:min