Norma's Average Speed Calculation

What was Norma’s average speed?

Norma’s average speed is 41.9 km/h.

Calculation of Norma's Average Speed

Explanation: Norma drives her car for 150 min at 40 km/h, then rests for 75 min, and then drives for 3.15 h at 60 km/h. To find Norma's average speed, we can use the formula: Average speed = Total distance / Total time Where: - Total distance (dT) is the sum of distances covered during each leg of the journey. - Total time (tT) is the sum of time taken for each leg of the journey. First, let's calculate the total distance: dT = (40 km/h * 150 min * 1 h / 60 min) + (60 km/h * 3.15 h) = 289 km Next, let's calculate the total time: tT = 150 min * 1 h / 60 min + 75 min * 1 h / 60 min + 3.15 h = 6.9 h Now, we can find the average speed: Average speed = 289 km / 6.9 h = 41.9 km/h Therefore, Norma’s average speed is 41.9 km/h.
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