what if question is a passenger train travels at a speed of 72 km/h a man on the passenger train observes a goods train travelling at the speed of 54km/h in the opposite direction. if the goods train passes him in 8secs, find the length of the goods train whats the answer and method for it

Which of the following questions describes the equation g + (-4) = -5? a)what number, when added to negative four, is equal to negative five? b)what number, when added to negative five, is equal to negative four? c)what number, when subtracted from negative four, is equal to negative five? d)what number, when subtracted from negative five, is equal to negative four?