Malcolm's maximum speed is 80km/h faster than Ravis
let Malcom = m, and Ravi = r
(m + r)/2 = 260
m = 80 + r
Plug in 80 + r for m
((80 + r) + r)/2 = 260
Simplify. Multiply 2 to both sides
(80 + 2r)/2(2) = 260(2)
80 + 2r = 520
Isolate the r. Subtract 80 from both sides
80 (-80) + 2r = 520 (-80)
2r = 440
divide 2 from both sides
2r/2 = 440/2
r = 220
m = 220 + 80
m = 300
hope this helps