Arkheenclydemolinaidn
Answered

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A car travelled 30 kilometers in 2 hours.What is the average speed?​

Sagot :

Mrshaileykozumeidn

Answer:

The general equation for average speed  v¯ , given a certain total distance  d  and total time  t , is

v¯=dt .

We are given two distances over two different amounts of time. We simply calculate

v¯=30+401+2=703=2313 .

So, we can conclude that the average speed is  23.333…  km/h, or  23  km/h to 2 significant figures.

Explanation:

Jylakadusale12idn

Answer:

Speed of car for first 30 minutes = 30 km h^{-1}

Speed of car for next 1 hour = 40 km h^{-1}

(a) total distance travelled by the car

First case

Speed = distance / time

distance = speed x time

= 30 x 0.5 ---- (30 min = 0.5 hour)

= 15 km ---- (i)

Second case

speed = 40 km h^{-1}

distance = 40 km x 1

= 40 km ---- (ii)

Adding (i) and (ii)

Total distance = 15 km + 40 km

= 55 km

(b) total time of travel = 0.5 hr + 1.0 hr = 1.5 hr

(c) average speed = total distance travelled/total time taken

= 5.5 km/ 1.5 hr

= 36.67 km h^{-1}

Explanation:

hope it helps

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