Question

A car travels a distance of 60km with a speed of 20km/hr and returns with a speed of 10km/hr. Calculate average speed.
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Answer 1

Answer:

Time taken while going = 60/20 =3 hrs

Time taken while returning = 60/10=6 hrs

Therefore,

Average speed =

$\frac{60 + 60}{6 + 3} = \frac{120}{9} = \frac{40}{3} = 13.33 \: kmph$

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Answer 2

Answer:

✞ Given that ✞

• Distance of 60km with a speed of 20km/hr.
• Returning speed is 10km/hr.

✞ To find ✞

• Average speed ?

✞ Solution ✞

Speed of the car = 20km/h

»» Distance covered = 60km

Time taken = Distance/Speed

=> 60/20

=> 3 hours

Speed of car while returning = 10km/h

»» Distance covered = 60km

Time taken = Distance/Speed

=> 60/10

=> 6 hours

Total distance covered by Car

=> 60 + 60

=> 120 km

Total Time taken by the car

=> 3h + 6h

=> 9 hours

Average speed = (Total distance / Total Time taken)

=> 120km / 9 hours

=> 120/9

=> 13 km/h

Therefore, Average speed covered by the Car is 13km/h.