Question

a train passes the telegraph posts which are placed 76 metres apart alongside a railway track at intervals of 4 seconds. At what rate is the train travelling in km per hour

Answer 1

i thinks it is 19 according to me

Answer 2

76m/4s = 19m/s
$19 \frac{m}{s} = 19 \times \frac{18}{5} \frac{km}{h} = \frac{342}{5} = 68.4 \frac{km}{h}$