Question

I need help with this asap

Answer 1

If Samuel can type 40 words per minute, he can type $40m$ words in $m$ minutes. So, the amount of minutes you're interested in is the solution of the equation

$40m = 3.5 \times 10^5 \iff m = \dfrac{3.5 \times 10^5}{40} = \dfrac{3.5 \times 10^5}{4\cdot 10} = \dfrac{3.5}{4} \times 10^4 = 0.875\times 10^4 = 8750$ minutes.

Since 8750/60 is 145 with reminder 50, Samuel can type the required amount of words in 145 hours and 50 minutes.