1. Some roads in Poland have a speed limit of 140 km/h. How fast is this in miles per minute?

All you have to do is this, Convert Km to Miles so 1 km = 0.621 miles, the convert hours to min, 1 hr = 60 min, then this is how you solve:140 (0.621 miles / 60 mins)

= 140 (0.01035 miles/min) = 1.449 miles/min

1.47 miles per minute