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Transport a batch of goods, a car 10 hours to complete, B car 8 hours to complete, now two cars together, a few hours to transport 1 / 2 of the money goods?
1/2÷(1/10+1/8)
=1/2÷9/40
=20/9
A: 20 / 9 hours can deliver 1 / 2 of the goods
You can ask me if you don't understand my answer!
Transport a batch of goods, a car 10 hours to complete, B car 8 hours to complete. Now a car and transport, how many hours to complete?
1/（1/8+1/10）=40/9
A pile of goods can be transported in 4 hours by car a alone and in 6 hours by car B alone. Now half of the goods are transported by car a and car B together. How much does it take
1 / 2 ÷ (1 / 4 + 1 / 6) = 1.2 hours
A pile of goods can be transported in 5 hours by car a alone and 4 hours by car B alone. How many hours does it take for two cars to transport 5 / 6 of this pile of goods together
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