Question 203758
#6. If a car travels 1/100 kilometer each second, how many kilometers does it travel in an hour?

I tried this 1/100*120 seconds... this is not right, I dont understand why.
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0.01 km/sec = 0.01 km/sec *60 sec/min * 60 min/hr
= 0.01*60*60 km*sec*min/(sec*min*hr)
= 36 km/hr
Notice how including the units makes it clearer.