For protection of level crossing gate in an emergency on BG double line the Gateman should place one detonator at one place and 3 detonators at a subsequent place at a distance of ------- a) and------- meters respectively
b) 400 meters in 800 meters
c) 500 meters and 1000 meters
d) 600 meters and 1200 meters*
e) 800 meters in 1500 meters
b) 400 meters in 800 meters
c) 500 meters and 1000 meters
d) 600 meters and 1200 meters*
e) 800 meters in 1500 meters