After leaving station a for 5 km and driving at an average speed of 40 km per hour for t hours, what is the distance for the car to leave station a?

After leaving station a for 5 km and driving at an average speed of 40 km per hour for t hours, what is the distance for the car to leave station a?

40t + 5km
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The speed of a car uphill is 20km / h, and it returns to the top of the slope immediately. When it goes downhill, the speed is 40km / h. what is the average speed of the car in the whole journey?

Let the length of the slope be s. according to v = st, the time taken to go up the slope, T1 = sv1, the time taken to go down the slope, T2 = SV2, the average speed of the whole journey v = s ′ t = 2sv1 + V2 = 2ssv1 + SV2 = 2v1v2v1 + V2 = 2 × 20km / h × 40km / h20km / H + 40km / h ≈ 26.7km/h