Question

A car covers a distance of 100 km between two cities A and B in 2 hours.Further it cover in 3 hour.calculate the average speed of the car​

Answer 1

Answer:

40 km/h

Explanation:

Total distance travelled = 100+100=200 km

Total time taken = 2hr+3hr=5 hrs

Average speed of the car = Total distance travelled/Total time taken

= 200 km

5 hr

=40 km/hr

Answer 2

Answer:

$distance = 100km \\ when \: time = 2h \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ speed_1 = \frac{100}{2} \: \: \: \: \: \: \: \: \: \: \: \: \: \\ speed_1 = 50km \: {h}^{ - 1} \\ when \: time = 3h \: \: \: \: \: \: \: \: \: \: \: \: \: \\ speed_2 = \frac{100}{3} km \: {h}^{ - 1} \\ average \: speed = \frac{speed_1 + speed_2}{2} \\ = \frac{50 + \frac{100}{3} }{2} \\ = \frac{ \frac{50(3)}{3} + \frac{100}{3} }{2} \\ = \frac{ \frac{150}{3} + \frac{100}{3} }{2} \\ = \frac{ \frac{250}{3} }{2} \\ = \frac{250}{3 \times 2} \\ = \frac{125 \times 2}{3 \times 2} \\ = \frac{125}{3} km \: h {}^{ - 1}$