exam Maths Puzzle Numerical Ability

im having trouble with 2 radical 7 over 3 radical 5 + 5 radical 3. I know to multiply the top and bottom by 3 radical 5 + 5 radical 3 but what im getting doesnt seem right.

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Which is the number 0.0000042 in scientific notation?

A. 0.42times10^-7 B. 4.2times10^6 C. 4.2times10^-6 D.4.2times10^-5 Over a distance of 120km, the avg. speed of a train is 40km/h faster than that of a car. If the train covers the distance in 30min less time, find its avg speed.

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