From the two cities, the distance between which is 120 km, two buses, whose speeds are constant

| September 27, 2021 | education

From the two cities, the distance between which is 120 km, two buses, whose speeds are constant and equal, respectively, 20 km / h and 60 km / h, at the same time to meet each other, after what time will the buses meet?

The travel time can be calculated using the formula:
t = S / V, where t is the time of movement (s), V is the speed of movement (km / h), S is the distance traveled (S = 120 km).
Since the buses are moving towards each other, the speed of convergence of buses is equal to:
V = V1 + V2, where V1 is the speed of the first bus (V1 = 20 km / h), V2 is the speed of the second bus (V2 = 60 km / h).
V = V1 + V2 = 20 + 60 = 80 km / h.
We will calculate the meeting time for buses:
t = S / V = 120/80 = 1.5 h.
Answer: Buses will meet in 1.5 hours.



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