Question

A car moves with a speed of 90km/h for half an hour 45km/h for 2hrs and 60km/h for 1 hrs. Calculate the average speed

Answer 1

Answer:

$\huge\mathfrak{\fcolorbox{purple}{silver}{answer}}$

Total speed = 90 +45+60 =195 km

Total time =1/2+2+1

Average speed = Total speed/Total time

$average \: speed = \red{\huge\frac{195}{ \frac{3}{2} }}$

$av = \purple {\huge \frac{195 \times 2}{3}}$

$av = \green {\huge \frac{390}{3}}$

$av = \pink{130 \frac{km}{h}}$

Average speed is 130km/hr

Answer 2

Question :-

A car moves with a speed of 90km/h for half an hour 45km/h for 2hrs and 60km/h for 1 hrs. Calculate the average speed .

Answer :-

In the given problem , the total distance traveled by car

= 90+45+60 = 195 km

Total time taken to complete the journey

= (30 + 120 + 60) minutes

= 210 minutes ➾ 210/60 h

We know that ,

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

Using V av = Total Distance Travelled / Total Time Taken

$= > \: \: \frac{195 \: \: km}{ \frac{210}{60 \: \: h} }$

$= > \: \: 27.14 \: \: km \: h$

Hence , average speed Covered by car = 27.14 km h