Total distance = 80 km. Distance covered by foot = y Distance covered by bicycle = (80 - y) Distance covered by foot in hours = x hrs. Distance covered by bicycle in hours = (8 - x) hrs. Speed by foot = 8 km/hr. Speed by bicycle = 16 km/hr First calculate the distance covered by foot. X =
y
8
⇒ 8x = y ... (i) Secondly, calculate the distance covered by bicycle. (8 - x) =
(80−y)
16
128 - 16x = 80 - y 128 - 80 = 16x - 8x 48 = 8x x = 6 hrs. Now distance covered by foot = 8 × 6 = y y = 48 km.