Question

Explain how to do B and D please

Answer 1

Answer:

18 ft/ 20 min = 0.90 ft/min is the greatest speed.

Step-by-step explanation:

You must find the unit rate of change for all four items:  A through D.  This will require some conversion of units of measurement.  Next you must determine which of your four results is the greatest / fastest.

A.  18 ft / 20 min = 9/10 ft/min, or 0.90 ft/min

B.  90 ft / 2.5 hr = 90 ft / 150 min = 6/10 ft/min, or 0.6 ft/min

C.  20 yd / 1.5 hr = 60 ft / 90 min = 6.7/10 ft/ min, or 0.67 ft/min

D.  3 2/3 yd / 15 min = (11/3)(3 ft) /  15 min = 7.3/10 ft /min, or 0.73 ft/min

Arranged in increasing size, we have:

6/10 ft/min, 6.7/10 ft/min, 7.3/10 ft/min and 9/10 ft/min.

The first answer choice, 9/10 ft/min, is the greatest speed.