# If a group travelled at 70 miles per hour (mph) for three hours and then 60 mph for five hours along a highway, how many miles they travelled?

$510$ miles along the highway
$70$ mph for $3$ hours means they have traveled $210$ miles, plus the added $300$ miles from $60$ mph for $5$ hours. so $7 \times 3 = 21$ add the zero. $5 \times 6 = 30$ add the zeros. Now add them together $210 + 300 = 510$ miles.