Question

if a train runs at 40 km per hour it reach its destination late by 11 minutes but if it run at 50 km per hour it is late by 5 minute only. find the correct time for the train to complete its journey.

Answer 1

Let the correct time to complete the journey be x min.

Distance covered in (x + 11)

min.= Distance covered in (x + 5) min at 50 km/hr

∴ (x+11)60 * 40

= (x+5)60 * 50

=x = 19 min.

Answer 2

let the number of time be X.

A/Q
$x + 11 = 40$
$x = 40 - 11$
$x = 29$
Again
$x + 5 = 50$
$x = 50 - 5$
$x = 45$
now
$1minute = 60second$
A/Q

$60x = 29 - 45$
$60x = 74$
$x = 74 - 60$
$x = 16$
the correct time for the train to complete this journey are 16.