Question

reena ran the first half of an x meter long race at a m/s and the second half at b m/s. find her average speed Sfor the race plz don't spam​

Answer 1

Answer:

2ab÷(a+b)

Step-by-step explanation:

average speed= total distance/total time

=(x/2+x/2)/ (x/2a +x/2b)

=x /  [(x/2)×(1/a +1/b)]

=2ab/(a+b)