Question

a train travels with a speed of 100km/hr from station A to B and then comes back with a speed of 200/3 km/hr from station B to station A. Find a) average speed b) average velocity​

Answer 1

Answer:

80km/h , 83.33 km/hr

Step-by-step explanation:

formula of average speed

$\frac{2 \times speed1 \times speed2}{speed1 + speed2}$

therefore

$\frac{2 \times 100 \times \frac{200}{3} }{100 + \frac{200}{3} }$

$\frac{ \frac{40000}{3} }{ \frac{500}{3} }$

$\frac{40000 }{500} = \frac{400}{5} = 80$

80 km/hr

formula of avg velocity

addition of speeds / 2

AVG VELOCITY = 100+200/3 ÷2

= 500/3 ÷2

= 500 / 6

= 83.33 km / hr