Question

Xin and Yvonne are standing 42 m apart. If they walk towards each other, they will meet after 12 seconds. If they walk in the same direction, Yvonne will catch up with Xin after one minute. It is given that Xin and Yvonne walk at constant speeds ofx m/s and y m/s respectively.

Form a pair of simultaneous equations in x and y.

Answer 1

12(x+y)=42

60(y-x)=42

Explanation:

12(x+y)=42 (12 seconds, x+y speed each second, 42 metres)

60(y-x)=42 (1 minute = 60 seconds, x-y speed each second, 42 metres)