A car travels at an average speed of 50 km in a day. how many kilometers in a year

Question

 im not able to understand the question

 etyuyui

 

Answer 1

"50 km in a day" is a speed(rate)

 

The problem asks you for an equivalent number of km per year.  The applicable constant is:

    1 = (365 days)/(1 year) = (1 year)/(365 days)         [choose the one so that units cancel; assume 365 exactly]

 

To change units without changing the value, we use the Multiplicative Identity (that is, 1).  Any number multiplied by +1 remains the same.

 

    50 km in a day

    50 km per 1 day

    (50 km) / (1 day)

    ( (50 km) / (1 day) ) * 1

    ( (50 km) / (1 day) ) * ( (365 days)) / (1 year) )            [days will cancel out]

    ( (50 km) * 365 ) / (1 year)

     ( 18250 km ) / (1 year)

        18250 km per year

      18,250 km in 1 year

 

Note: Units are very, very important !   (see --  http://spacemath.gsfc.nasa.gov/weekly/6Page53.pdf )

Answer 2

 

50 km is a distance, not a speed.  So there is an issue with the wording of the question.

 

If the car travels 50 km each day, then you would simply multiply 50 by 365 (the number of days in a year)

 

50 • 365 = 18,250 km