In a journey of 15 miles, two third distance was travelled with 40 mph and remaining with 60 mph. how much time does the journey take?

The first step in solving this question is to split the journey into 2 parts. In the first part of the journey, miles are covered at a speed of 40 mph. In the second part the journey 5 miles are covered at a speed of 60 mph.

The equation to compute the time of a journey  given the speed and distance is where is the time, is the speed and is the distance.

The time for the first part of the journey is calculated as shown below,

.

The time for the second part of the journey is calculated as follows,

.

The total time is the sum of the times taken to cover each part of the journey and is calculated as shown below,

The time to cover the journey is a third of an hour or 20 minutes.

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

47 - 90 = 43

43 - 180 = x

x = 137