Converting Speeds

Example: Sophie is driving at 60 km/h. The speed limit is 40 mph. Is she breaking the speed limit?

1) First convert 60 km into miles: 1 mile = 1.6 km - Conversion factor = 1.6

60 x 1.6 = 96 - too big

60 divide 1.6 = 37.5- makes sense, so 60 km = 37.5 miles

2) Add in the "per hour" bit to get the speed:

60 km/h = 37.5 mph

So, Sophie isnt breaking the 40 mph speed limit.

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