can somebody solve this?

Question

A train leaves Little Rock, Arkansas, and travels north at 75 kilometers per hour. Another train leaves at the same time and travels south at 80 kilometers per hour. How long will it take before they are 620 kilometers apart?

Answer 1

distance = rate x time

 

620 = (75+80)* t

 

620= 155 * t

 

620/155 = t 

 

t=4