book Maths Puzzle Numerical Ability

Pablo is driving 40 miles per house. After he has driven 30 miles, his brother Ricardo starts driving in the same direction. At what rate must Ricardo drive to catch up with Pablo

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a friend has trouble simplifing 20-(-38).Explain how to solve this problem I'm really lost on how to do these.

Depreciation,solve the literal equation for the indicated variable.

D = c- S
______
N


(for s)


c-s then ___ under is