Kim ate 3⁄10 of a bag of potato chips; sandy ate 3⁄7 of a bag; and jeff ate 3⁄9 of a bag. who ate the most, kim, jeff, or sandy?

The most is Sandy

Step-by-step explanation:

we know that

When we compare fractions of the same numerator and different denominator, the fraction with the lowest denominator is greater

so

In this problem we have

Kim ate of a bag

Sandy ate of a bag

Jeff ate of a bag

the lowest denominator is  

therefore

The most is Sandy

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.