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Minchanka [31]
3 years ago
5

Anil completes the 72km journey between Bristol and Cardiff in 48 minutes.

Mathematics
2 answers:
eimsori [14]3 years ago
5 0

total distance travelled=72+69=141

time taken in hours for journey= (48/60)h + (69/60)= 1.95 h

average speed=141km/1.95h= 72.3km/h (3 sf)

Talja [164]3 years ago
3 0

think about the journey as two parts and the total journey.

<u>first</u><u> </u><u>part</u><u>:</u>

first you need to find the speed of the first part but you need to convert 48mins to hours which is 0.8 hours.

speed = 72 ÷ 0.8 = 90km/h.

<u>second</u><u> </u><u>part</u><u>:</u>

then you need to find the time it took to complete the second part of the journey.

time = distance/speed = 69 ÷ 60 = 1.15hours

<u>total</u><u>:</u>

then you can find the total distance for both parts of the journey by doing <em>7</em><em>2</em><em>km</em><em> </em><em>+</em><em> </em><em>6</em><em>9</em><em>k</em><em>m</em><em> </em>which is 141km.

the total time would be <em>0</em><em>.</em><em>8</em><em> </em><em>h</em><em>o</em><em>u</em><em>r</em><em>s</em><em> </em><em>+</em><em> </em><em>1</em><em>.</em><em>1</em><em>5</em><em> </em><em>h</em><em>o</em><em>u</em><em>r</em><em>s</em><em> </em>which is 1.95 hours.

now you have the total distance and time so you can find the average speed for the whole journey.

speed = distance ÷ time

= 141 ÷ 1.95

= 72.307692307.... km/h

<em>(</em><em>y</em><em>o</em><em>u</em><em> </em><em>c</em><em>a</em><em>n</em><em> </em><em>r</em><em>o</em><em>u</em><em>n</em><em>d</em><em> </em><em>y</em><em>o</em><em>u</em><em>r</em><em> </em><em>a</em><em>n</em><em>s</em><em>w</em><em>e</em><em>r</em><em> </em><em>t</em><em>o</em><em> </em><em>7</em><em>2</em><em>.</em><em>3</em><em>k</em><em>m</em><em>/</em><em>h</em><em>)</em>

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