Two places 3

The distance between two places A and B 90 km. Two cars start together from A and B .If both the cars go in the same direction, they meet after 9 hours and if they go in opposite directions they meet after 9/7 hours . Find their speeds .(Assume that A has greater speed) .

Correct answer:

v1 =  40 km/h
v2 =  30 km/h

Step-by-step explanation:

a=90 km t1=9 h t2=9/7=791.2857 h  v1>v2  v1 t1=a+v2 t1 v1 t2+v2 t2=a v1 9=90+v2 9 v1 1.2857142857143+v2 1.2857142857143=90  9v19v2=90 1.285714v1+1.285714v2=90  Row291.28571429 Row1Row2 9v19v2=90 2.57v2=77.14  v2=2.5714285777.14285714=30 v1=990+9v2=990+9 30=40=40 km/h  v1=40 v2=30



Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Do you have a linear equation or system of equations and are looking for its solution? Or do you have a quadratic equation?
Do you want to convert length units?
Do you want to convert velocity (speed) units?
Do you want to convert time units like minutes to seconds?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: