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Ex. 2: If the measuring distance is extended to 2 km or miles or shortened to 0.5 km or miles
and Second hand indicates “80” on tachymeter scale:
“80” (tachymeter scale figure) x 2 (km or mile) = 160 km/h or mph
“80” (tachymeter scale figure) x 0.5 (km or mile) = 40 km/h or mph
To measure the hourly rate of operation
Ex. 1
Ex. 2: If 15 jobs are completed
in 12 seconds:
Use the stopwatch to measure
the time required to complete 1
job.
1
Tachymeter scale indicated by
Second hand gives the average
number of jobs accomplished per
hour.
2
“300” (tachymeter scale figure) x 15 jobs
= 4500 jobs/hour
“300” (tachymeter
scale figure) x 1 job
= 300 jobs/hour
➚
Tachymeter
scale: “300”
Second hand:
12 seconds