When a man stands on a moving escalator he goes up in 50 sec. and when he walks up the moving escalator he goes up in 30 sec. Then the man walks up the stationary escalator in a time of ………… sec

When a man stands on a moving escalator he goes up in 50 sec. and when

1.	When a man stands on a moving escalator he goes up in 50 sec. and when he walks up the moving escalator he goes up in 30 sec. Then the man walks up the stationary escalator in a time of ………… sec
Answer» 60 75 90 `18.75` ANSWER :B