Question

[16] An aeroplane flies from A to B at the rate of 500 km / hr and comes
back from B to A at the rate of 700 km/hr. The average speed of the
aeroplane is :
(a) 600 km/hr
(b) 583.33 km/hr
(c) 100/35 km/hr
(d) 620 km/hr. (1 mark)​

Answer 1

Answer:

By the formula:-

$2xy \div x + y$

Answer 2

Answer:

Total distance b/w A and B is the lcm of 500&7oo

ie, 3500

3500/500=7 hrs

3500/7=5hrs

Av.speed is:

7000/12=.583,33km/hr. Ans