exam Maths Puzzle Numerical Ability

can you help?
1. 3/x = 7/5

2.5a^2b/12a multiplied by 2a^3b/15ab^6

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exam Other Question

A plane flies 720 mi against a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane’s speed in still air? please help me with this equation :)
4c+3(c-2)=-34