Question

man riding a bicycle covers a distance of 60 km in the direction of wind and come back to its original position after 8 hour speed of the wind is 10 km an hour find the speed of bicycle​

Answer 1

Answer:

Let speed of bicycle be x

Then, 60/x + 10 + 60/x -10 = 8

60x − 600 + 60x + 600 = 8 (x² − 100)

120x = 8x² − 800

x² − 15x − 100 = 0

x² −20x + 5x − 100 = 0

(x − 20)(x + 5) = 0

x = 20, − 5

Speed cannot be negative.

Hence, speed of bicycle is 20 km/hr