exam Maths Puzzle Numerical Ability

how do you simplify 4(3 x 10^5) then write it in scientific notation?

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exam Other Question

The Tower of Hanoi invented by Edouard Lucas in 1883. The puzzle consists of 3 pegs and a number of disks of distinct diameter stacked on one of the pegs such that the largest disk One morning, John drove 5 hours before stoping to eat. After lunch, he increased his speed by 10 mph. If he completed a 430-mile trip in 8 hours of driving time, how fast did he drive in the morning?