A car travels 250km and stops along the way. the entire trip takes 5 hours. what is the average speed of the car
a) 25 km/h
b) 40 km/h
c) 50 km/h
d) 250 km/h

Option c) 50 km/h

Explanation:

Distance traveled by car = 250km

Time taken = 5 hours

Average speed of the car = ?

Recall that average speed is the total distance travelled divided by the total time taken.

i.e Average speed = Distance / Time

= 250km/5 hours

= 50 Km/hr

Thus, the average speed of the car is

50 Km/hr

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

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