English
11
“90” (tachymeter scale figure) x 2 (km or mile) = 180 km/h or mph
“90” (tachymeter scale figure) x 0.5 (km or mile) = 45 km/h or mph
To measure the hourly rate of operation
Ex. 2: If 15 jobs are completed in 20 seconds:
“180” (tachymeter scale figure) x 15 jobs = 2700 jobs/hour
Ex. 1
STOPWATCH
second
hand:
20 seconds
“180” (tachymeter scale figure) x
1 job = 180 jobs/hour
Tachymeter
scale: “180”
1 Use the stopwatch to measure
the time required to complete 1
job.
2 Tachymeter scale indicated by
STOPWATCH second hand
gives the average number of
jobs accomplished per hour.
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