Question

a car traveld with speed 30km per hour for 30 minutes and then with speed 40 km per hour for 1 hour find the average speed of the car​

Answer 1

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

1st case, speed = Distance/Time ⇒ Distance = Speed × Time

(∵ 30 minutes = 0.5 hours)

Distance = 30 × 0.5

= 15 km ……(i)

IInd case Speed = Distance/Time ⇒ Distance = Speed × Time

Distance = 40 km h-1 × 1 hr

= 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 hrs = 1.5 hr

(c) Average speed = Total distance travelled/Total time taken

= 5.5 km/1.5 hr [from above (a) and (b)]

= 36.67 km h-1

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Answer 2

Answer:

Average Speed is 36.67Km/H (Almost)

Explanation:

$average \: speed \: = \frac{distance \: covered}{time \: taken}$

Total Distance Covered = (30Km/H × ½H)+(40Km/H×1H)

= (15+40)Km = 55Km

Total Time Taken = (½+1) H = 1½H

$average \: speed \: = \frac{55}{1 \times \frac{1}{2} } kmh^{ - 1}$