Answer :
Amount earned in one hour : 6.25
Amount needed to earn : 400
So, number of hours required for earning the required amount :
= Needed amount/Amount earned in an hour
= 400/6.25 = 64
Amount needed to earn : 400
So, number of hours required for earning the required amount :
= Needed amount/Amount earned in an hour
= 400/6.25 = 64