Question

A train covers 3/7 of the total distance in 1st hour of journey
and covers 2/5 of the journey in second hour How much is the
journey left?​

Answer 1

$\huge \bf Solution$

Let the journey left be x

$\large \sf x = \dfrac{3}{7} -\dfrac{2}{5}$

LCM of 5 and 7 is 35

15 - 14/35 = x

1/35 = x