A car delivers goods to the mountain area, 42 kilometers per hour, 67 hours to arrive. It only takes 34 hours to return from the original road, how many kilometers per hour on average?

A car delivers goods to the mountain area, 42 kilometers per hour, 67 hours to arrive. It only takes 34 hours to return from the original road, how many kilometers per hour on average?

42 × 67 ÷ 34 = 36 × 43 = 48 (km / h). A: when returning, the average distance is 48 km / h

A car delivers goods to the mountain area, 42 kilometers per hour, 67 hours to arrive. It only takes 34 hours to return from the original road, how many kilometers per hour on average?

42 × 67 ÷ 34 = 36 × 43 = 48 (km / h). A: when returning, the average distance is 48 km / h

A car delivers goods to the mountain area. It takes 48 kilometers per hour to get there, 7 / 8 hours to get to the original road, and 5 / 8 hours to return. What's the average line per hour
What is the average speed of a round trip

48x (7 / 8) / (5 / 8) = 67.2 (km)
A: on return, the average distance is 67.2 kilometers per hour
Average speed of a round trip: 48x (7 / 8) = 42 (km) 42 △ [(7 / 8 + 5 / 8) △ 2] = 56 (km)
A: the average speed of a round trip is 56 km / h

A car delivers goods to the mountain area. It takes 48 kilometers per hour to go and 78 hours to arrive. It takes only 58 hours to return from the original road. How many kilometers per hour do you travel on average when you return? How many kilometers per hour is the average speed of a round trip?

(1) 48 × 78 △ 58 = 42 × 85 = 67.2 (km). (2) 48 × 78 × 2 ^ (78 + 58) = 42 × 2 ^ (32 = 84 × 23 = 56 (km). A: the average travel speed is 67.2 km per hour when returning, and the average speed of a round trip is 56 km per hour