GATE Mechanical 2025 | Question: 55

Question

A project involves eight activities with the precedence relationship and duration as shown in the table below. The slack for the activity $D$ is _________ hours (answer in integer).

Activity	Immediate predecessor	Duration (hours)
$A$	-	$4$
$B$	$A$	$8$
$C$	$A$	$5$
$D$	$B$	$2$
$E$	$B$	$7$
$F$	$C$	$6$
$G$	$D$	$3$
$H$	$E, F, G$	$9$