solve the following mathematical problems:

After travelling 108km, a cyclist observed that he would have required 3 hours less if he could have traveled at a speed 3 km/hr more. At what speed did he travel?

Created: 1 year ago | Updated: 1 year ago
Updated: 1 year ago

Let,

The original speed = x km/h

ATQ, 

108/x - 108/x + 3 = 3

=> 108x + 324 - 108x/x2 + 3x = 3

=> 3x2 + 9x - 324 = 0

=> 3(x2 + 3x - 108) = 0

=> x2 + 3x - 108 = 0

=> x2 + 12x - 9x - 108 = 0

=> (x + 12)(x - 9) = 0

=> x = 9

Therefore, original speed 9.

1 year ago

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