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Second-year mathematics outward bound training.
Lily spent seven minutes making a flower.

So it takes 7×5=35 minutes for Lily to make five flowers.

Ping Li made five flowers in 30 minutes.

So Lily spent a long time making a flower.

It takes Lily 35-30 minutes longer to make five flowers than Li Ping.

Then lily 1 min makes 1 flower more than Li Pinghua 1 flower.

So it takes a long time for lily to make a flower, 1 minute.