Depends on your basal metabolic rate

For loosing weight you need to control diet as well. Exercise alone wont help. Loosing weight is a big task ,most of us go on strict diet but that is not the solution for it. You need to take healthy diet in approriate ratio ( Less Carbs,include protein and fiber in your meal) and dont skip the meal .Exercise for 30-45 min with diet will help in reducing weight.

It depends on your own height and weight.

For weight loss , only walking is not sufficient, physical activity and diet should be done in a balanced way. For the details , consult

As per the guidelines, 30-45 mins brisk walk should be done 5-6 days a week.

Kindly consult me here or on whatsapp 9971*805905 ,will help you out in proper guidance