A cyclist rides her bike at a rate of 15 kilometers per hour. What is this rate in kilometers per minute? How many kilometers will the cyclist travel in 20 minutes? Dont round.
2007-02-05 07:00:28 · 2 answers · asked by tiffany_da_finest 1 in Education & Reference ➔ Homework Help
15km/1hour x 1hour/60minutes = km/minute
km/minute x 20minutes = km in 20 minutes
2007-02-05 07:13:48 · answer #1 · answered by Lauren J 2 · 0⤊ 0⤋
Speed = 15 km/h
To convert, mulitply by a conversion rate. To decide the rate, you need to make sure the old unit is on the opposite side of the fraction in your conversion rate. For example, since in speed, hours are on the bottom of the fraction, then your rate needs to have hours on top: 1 h / 60 min
Your conversion rate is a fancy way of multiplying by 1. 1h = 60 min, so 1 h / 60 min = 1. However, the units cancel after you multiply, leaving you with the units you need.
speed = 15 km/h * 1 h / 60 min = .25 km * h /min * h = .25 km/min
.25 km/min * 20 min = 5 km
2007-02-07 04:29:00 · answer #2 · answered by ³√carthagebrujah 6 · 0⤊ 0⤋