Total distance to be travelled = 280 + 120 = 400 m
Speed should be converted into m/s.
Speed = 40 kmph = 40 × 5/18 = 100/9 m/s
Time = D/S = 400/100/9 = 36 s
Speed should be converted into m/s.
Speed = 40 kmph = 40 × 5/18 = 100/9 m/s
Time = D/S = 400/100/9 = 36 s

