you only have to change the signs because all though the speeds are the same the cars are now moving AWAY from the intersection, so dy/dt = 60, not -60, and dx/dt = 30, not -30. This means that instead of 1.2 * -30 + 1.6 * -60 = 2 ds/dt, it would be 1.2 * 30 + 1.6 * 60 = 2 ds/dt. Therefore if you simplify you get a ds/dt of 66 miles/hour, which
Five of the most common deer species are the white-tailed deer, elk, reindeer, moose, and mule deer. White-tailed deer can run 30 mph while moose and mule deer can both run 35 mph. Next up, elk can run 45 mph. Most impressively of all, reindeer can run 50 mph. When people think of reindeer, they often connect this species to Christmas and the
At an average speed of 26.12 mph (42.03 km/h), Jonas Vingegaard's 2022 Tour de France victory was the fastest in history. Maurice Garin's average speed on his way to victory at the inaugural 1903 Tour was 15.96 mph (25.68 km/h) - which is still remarkable considering the ancient equipment cyclists rode on, the absence of teams, and each
How fast does a mountain biker go? Average speed for a mountain biker ≈ 10 mph (16 kph) during singletrack riding. Uphill sections average ≈ 8 mph (13 kph) with downhill sections averaging ≈ 12 mph (19 kph). The overall average speed for pro/semi-pro cross-country mountain bikers is ≈ 9 mph (14.5 kph) The average speed is ≈ 17 mph (27
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