Question

5. A car travels at a speed of 50 km/hr for 30 minutes, and then 70 km/hr for next 45 minutes
What is the average speed of the car?
[Ans. 56.66 km/hr]​

Answer 1

Answer:

answer: Average speed of the car is 56.66km/hr

Answer 2

$\huge\tt\red{As&nbspper&nbspyour&nbspquestion,&nbspSolution:62km/hr}$

$\green{\boxed{Ave.&nbspSpeed=Total&nbspS÷Total&nbspT}}$

$\boxed{Distance=Speed×Time}$

$\mathbb\blue{DISTANCE}$

$\orange{Have&nbspto&nbspconvert&nbspmins&nbspinto&nbsphours}$

⇨ 50×(30/60) = 50×1/2 = 25km

⇨ 70×(45/60) = 70×3/4 = 52.5km

TOTAL DISTANCE=25.0 + 52.5 = 77.5km

$\mathbb\blue{TIME}$

⇨ 1/2 + 3/4 = 5/4hr

$\mathbb\blue{AVE&nbspSPEED}$

⇨ 77.5 ÷ 5/4 = 77.5 × 4/5 = 62km/hr

✓✓✓

$\huge\bold\green{True&nbspQuestion}$

☆ A car travels at a speed of 50km/hr for 30mins, 70km/hr for next 45mins, 30km/hr for another 15 mins . What's the average speed of the car ???

$\huge\bold\green{Calculation&nbspand&nbspSolution}$

$\mathbb\blue{DISTANCE}$

⇨ 50×(30/60) = 50×1/2 = 35km

⇨ 70×(45/60) = 70×3/4 = 52.5km

⇨ 30×(15/60) = 30×1/4 = 7.5km

☆ 35 + 52.5 + 7.5 = 85km

$\mathbb\blue{TIME}$

1/2 + 3/4 + 1/4 = 1½ = 3/2 hr

$\mathbb\blue{AVE.&nbspSPEED}$

⇨ 85 ÷ 3/2

= 85 × 2/3

= (85×2) ÷ 3

= 170 ÷ 3

= 56.66666

✓✓✓

$\orange{I&nbspHOPE&nbspTHIS&nbspHELPS&nbspYOU}$