Question

Please helppp! 

1. To convert meters per second to kilometers per hour, which of the conversion factors would be used? SELECT ALL THAT APPLY.
a) 1km/1,000m
b) 1,000m/ 1km
c)1min/60sec
d)60sec/1min
e)60min/1h


2. Convert 2 Liters to gallons. Use the fact that 1gal=3.8L
a) 22L=3.2gal
b)22L=5.8gal
c)22L=8.4gal
d)22L=83.6gal


3.Convert 5 inches per second to feet per minute.
a)1ft/ min
b)25ft/min
c)60ft/min
d)3,600ft/min


please help thanksss!

Answer 1

(a) answer : a,d,e

(b) answer : b)22L=5.8gal

(c) answer : b)25ft/min

1. Convert meters per second to kilometers per hour,

1 kilometer = 1000 meters

1 meter =
`(1)/(1000)`

1 hour = 60 minutes. it means
`(60 minutes)/(1 hour)`

1 minute = 60 seconds. it means
`(60 seconds)/(1 minute)`

so
`(1)/(1000)` ,
`(60 minutes)/(1 hour)` and
`(60 seconds)/(1 minute)` are the conversion factors used.

(2): Convert 22 Liters to gallons

1gal=3.8L

1 litre =
`(1)/(3.8)` gallons

22 litre =
`22* (1)/(3.8)` gallons= 5.8 gallons

(3)Convert 5 inches per second to feet per minute.

We know 1 feet = 12 inches and 1 minute = 60 seconds

1 inches per second =
`(1)/(12) * (60)/(1)`= 5 feet per minute

5 inches per second = 5 * 5 = 25 feet per minute