Given: Mary travels 22 m in 8 s and John travels 22 m in 6 s. Concept Used: In this type of question, since distance travelled by both is same, then average speed can be calculated with the help of below formula. Formula Used: Average speed = total distance/total time Calculation: Using the above formulae, where total distance =(22+22)m=44m , and total time = (8+6)s=14s, we get ⇒ average speed =44/14ms−1 ⇒3.14ms−1 ∴ average speed =3.14ms−1