#### Answer

$70\text{ mph}\approx 112.654\text{ kmph}$

#### Work Step by Step

If want to convert from miles per hour to kilometers per hour, we have to consider the following conversion rate:
$0.62137\text{ mph}\approx 1 \text{ kmph}$
By dividing both sides by $0.62137$, we get:
$1\text{ mph}\approx \frac{1}{0.62137} \text{ kmph}$
We mulitply both sides by 70 in order to get the answer to the question:
$70\text{ mph}\approx \frac{70}{0.62137} \text{ kmph}\approx 112.654\text{ kmph}$