Problema Solution
2 biker start moving towards each other when they were 300km away. speed of 1st is 7km/hr more than 2nd. distance b/w them after 2hr is 34km. find their speed?
Answer provided by our tutors
let
x = the speed of the first biker
y = the speed of the second biker
300 km the start distance between them
speed of 1st is 7km/hr more than 2nd
x = y +7
after t = 2 h
the distance between them = the start distance between them - (the km of the 1st + the km of the 2nd)
and by using the formula distance = speed * time we can write
34 = 300 - (2*x + 2*y)
by solving the system of equations
x = y +7
300 - (2*x + 2*y) = 34
we find
x = 70 km/h
y = 63 km/h
the speed of the 1st is 70 km/h.
the speed of the 2nd is 63 km/h.