Time =
(40/10)*50+(40/10)*10+(10*0.1*4+10*0.9*0.1*3+10*09*09*0.1*2+10*09*09*09*0.1)/10*50
= 285.245 mins
4 hours 45mins 14.7 seconds
(40/10)*50+(40/10)*10+(10*0.1*4+10*0.9*0.1*3+10*09*09*0.1*2+10*09*09*09*0.1)/10*50
= 285.245 mins
4 hours 45mins 14.7 seconds