Question

Q10. A car moves with a speed of 30 km/h- for half an hour, 25 km/h- for one hour and 40 km/h
for two hours. Calculate the average speed of the car.
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Answer 1

Answer:

$\bold\red{\boxed{AVERAGE\:SPEED}}$

$=TOTAL\:DISTANCE÷TOTAL\:TIME$

$=30km+25km+40km÷30min+1hr+2hr$

$=95km÷3hr\:30mins$

$= \: 95 \: \div \: 3\frac{1}{2}$

$= \: 95 \: \div \: \frac{7}{2}$

$= \: 95 \: \times \: \frac{2}{7}$

$= \: 15 \: \times \: 2$

$= 30 km/hr \:is \:the\:average\:speed$

$\bold\green{\boxed{HOPE\:IT\:HELPS\:YOU}}$

Answer 2

Answer:

Distance= Speed *Time

Distance 1:- =30km/hr * 1/2hr

= 15 km

Distance 2:-=25km/hr * 1 hr

= 25 km

Distance 3:-=40km/hr * 2 hrs

= 80km

Average speed= (Total Distance)/(Total time)

=( 15+25+80)/(1/2 +1+2)

=120/(7/3)

= 120*(3/7)

= 360/7

= 51.42 km/hr