exam Maths Puzzle Numerical Ability

A=1/2(b+B) solve for B

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Joe has a collection of nickels and dimes that is worth $6.00. If the number of dimes were doubled and the number of nickels were increased by 6, the value of the coins would be $9.90. How many dimes does he have? My question is: The distance of the sun to the earth is 150,000 kilometers. the speed of light is 460,000 km./sec. How long it take for light to travel from the sun to the earth. Express your answer in scientific notation.