1.Billy finished a 400m race in 64 seconds .Find his speed in the unit of km/h.
2.The manager of a 24-hour fast food shop estimates that there are 1500 customers in 6 hours. Express the rate in following units : customers/day.
mathematics(Rate)
2011-09-12 4:37 am
回答 (2)
2011-09-12 4:56 am
✔ 最佳答案
1. Billy finished a 400m race in 64 seconds .Find his speed in the unit of km/h.Ans :
Speed
= distance / time
= 400 / 64
= 6.25m/s
1m/s = 1*60*60/1000km/h = 3.6km/h
Speed = 6.25 * 3.6 = 22.5km/h
2. The manager of a 24-hour fast food shop estimates that there are 1500 customers in 6 hours. Express the rate in following units : customers/day.
Ans :
Rate
= 1500 customers in 6 hours
= (1500 * 4)customers in 24 hours
= 6000 customers/day
參考: me
2011-09-12 5:55 am
1.400m=2/5km
64s=64/3600=4/225h
speed=(2/5)/(4/225)=(2/5)*(225/4)=45/2=22.5km/h
2.number of customers per h=1500/6=250
rate=250*24=6000customers/day
64s=64/3600=4/225h
speed=(2/5)/(4/225)=(2/5)*(225/4)=45/2=22.5km/h
2.number of customers per h=1500/6=250
rate=250*24=6000customers/day
參考: me
收錄日期: 2021-04-13 18:13:54
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