From point A to point B, the distance between which is 20.5 km, a pedestrian exited at a speed of 3 km / h.
| April 7, 2021 | education
From point A to point B, the distance between which is 20.5 km, a pedestrian exited at a speed of 3 km / h. In 1 hour, a second pedestrian came out of point B to A at a speed of 4 km / h. In how many hours after the exit of the second pedestrian they will meet.
The number of hours after which the pedestrians will meet after the exit of the second pedestrian is determined by means of the conditional variable “Y”.
The next step, using the example data and taking into account the formula for the speed, we get the equation: Y = (20.5 – 3 x 1) / (3 + 4).
As a result of solving this equation, we get Y = (20.5 – 3) / 7 = 17.5 / 7 = 2.5 hours.
Answer: pedestrians will meet 2.5 hours after the exit of the second pedestrian.
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