Given: Total distance = 80 km Fare of train = Rs. 8/km Fare of bus = Rs. 10/km Total fare = Rs. 700 Calculation: Let the distance travelled by bus be x km ⇒ Distance traveled by train = (80 - x) km According to the question: 10x+(80−x)8=700 ⇒ 10x+640−8x=700 ⇒ 2x=60 ⇒ x=30 ∴ Distance traveled by bus = 30 km