Question 147417
Train travelling  north

     speed = 60 miles per hr
distance to be covered  = 280 miles

      time taken to cover 280 miles =  distance covered  / speed
                                   =       280 miles / 60 miles per hour
                                   = 4.6666    hr
                                   =  4 hr + 0.6666  
                                   =  4hr  + 0.6666 x 60 minutes
                                   =  4 hr + 40 minutes
                                   =  4hrs 40 minutes

 Train travelling to south

        speed  =   80 miles per hour

 distance to be covered =  280 miles
        time taken =  distance / speed
                   =  280 miles / 80 miles per hr
                   = 3. 5 hr
                   =  3hrs + 0.5  x 60 
                   =  3 hrs + 30 minutes
                   =  3hrs 30 minutes

i.e, train travelling north covers 280 miles in 4 hrs 40minutes while train travelling  south takes  3 hrs 30 minutes to cover 280 miles.