Science Riddles

Doctor Harish and a bus driver Manish are both in love with the same woman named priyanka.
The bus driver need to go for a long trip of 10 days. Before he left he gave priyanka 10 apples. Why?
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I give you a group of three. One is sitting down, and will never get up. The second eats as much as is given to him, yet is always hungry. The third goes away and never returns.
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