Question

A car travels 40 km in 20 min next 30 km in 30 min. Calculate the average speed for the whole journey

Answer 1

Answer:

AVERAGE SPEED:

(40 km + 30 km)/(20 min + 30 min)

70 km / 50 min

1.4 km per minute

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Answer 2

Answer:

A car travels 40 km in 20 min

Distance (D 1) = 40 km = 0.04 m

Time taken (t 1) = 20 min = 20*60 = 1200 sec

Car travels next 30 km in 30 min

Distance (D 2) = 30 km = 0.03 m

Time taken (t 2) = 30 min = 30*60 = 1800 sec

Average speed = total distance/total time taken

Average speed = D 1 + D 2/t 1 + t 2

Average speed =0.04+0.03/1200+1800

Average speed = 0.07/3000

Average speed = 2.3 m/s

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