The formula for t=s/(v₁+v₂), and the value of t is 2 hours.
Step-by-step explanation:
The question is on relative speed.
For the two trains moving towards each other , the relative speed is the sum of their speeds.
Distance between the cities= s miles
Train 1 : speed is v₁ mph
Train 2: speed is v₂ mph
Time of meeting= t
Applying formula for speed, speed =distance/time
Time of meeting= Distance/relative speed
t=s/(v₁+v₂)
Given s=310, v₁=75 and v₂=80, then finding t
t=310/(75+80)
t=310/155 = 2 hrs
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Relative Speed : brainly.com/question/13080364
Keyword : speed
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