A car drive took a total of 2 hours to make a journey of 75km. He had a coffee break of half an hour and spent a quater of an hour stationery in a traffic jam. What aws his average speed during the journey?
Answers
Explanation:
HEY MATE HERE IS UR ANSWER
GIVEN THAT
A CAR TRAVELS A DISTANCE OF SCIENTIFIC KILOMETRE IN 2 HOURS AT A UNIFORM SPEED.
WE NEED TO FIND ITS SPEED IN BOTH KM/H AND M/S
SO WE HAVE
DISTANCE (S) = 75 KM
TIME (T) = 2 HOUR
THEREFORE SPEED OF THE CAR IS =
\frac{distance}{time}
time
distance
THAT IS
\frac{75km}{2hr} = 37.5 \: km \: per \: hour
2hr
75km
=37.5kmperhour
THEREFORE SPEED IN KM/HR
EQUAL TO
37.5 KM/HR
NOW TO CONVERT THIS IN M/S WE HAVE A SHORTCUT METHOD
THE METHOD IS TO MULTIPLY THE SPEED IN KM/HR BY 5/18 TO CONVERT IT INTO M/S
THAT IS
37.5 \times \frac{5}{18} = 10.42 \: meter \: per \: second \:37.5×
18
5
=10.42meterpersecond
THERE FOR SPEED OF CAR IN
KM / HR = 37.5 KM / HR
AND IN
M/S = 10.42 M/S
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Answer:
your answer is 60km/h
Explanation:
The definition of AVERAGE SPEED is:
TOTAL distance traveled divided by the TOTAL time to travel that distance.
The TOTAL distance = 75 km
The TOTAL time = 2 h
therefore by definition the
AVG SPEED = 75/2 = 37.5 km/h
If the driver doesn t move for 1/2 h + 1/4 h = 3/4 h
then
she must make the TOTAL distance in 2 - 3/4 = 1 1/4 = 1.25 h
to do this, by definition, she must have an
AVG SPEED = 75/1.25 = 60 km/h