Question

the second class railway fare for 240 kilometre of journey is rupees 15 what would be the fare for a journey of 139. 2 kilometre assume that the fair varies directly as the length of journey

Answer 1

fare of 240 km =rs 15
fare of 1 km =rs(15/240)
fare of 139.2 km=rs.(15*139.2)/240
= rs.139.2/16
= rs 8.70 (ans)

Answer 2

✷ Given :

   Fare for 240 km of journey

   is in rupees 15

✷ To find :

   What would be the fare

    of journey of 139.2 km.

                                                               

|      Distance          |            Cost           |

|      240  Km                 |        Rs. 15                 |

|     139.2  Km                |        Rs. x                   |

✷  Here is direct variation,

 So,

 According to the question

$\implies\dfrac{240}{139.2}=\dfrac{15}{x}$

✷ Now we have to do cross

    multiplication.

Then we get,

$\implies240\times x=139.2\times15\\\\\\\\\implies x=\dfrac{139.2\times15}{240}\\\\\\\\\implies x=\dfrac{139.2\times1}{16}\\\\\\\\\\\implies \bold{\Huge{\boxed{x=8.7}}}$

✷ Therefore Rs. 8.7 would be the

    fare for a journey of 139.2 Km.