Question

If a man travels 65km in 3 days by walking 7½ hours a day,in how many days will he travel 156km by walking 8 hours a day

Answer 1

He walks per day =7.5 hrs
He walks in 3 days= 7.5×3=22.5 hrs
And he travelled 65km in these 22.5hrs
So the speed = Distance / time
=65/22.5 =2.88 km/h
Speed of the man will remain same,
So time = distance/speed
= 156/2.88 = 54 hrs
Everyday he walks 8hrs, so for 54 hrs, he has to walk 54/8 = 6.75 days

Answer 2

ʜᴇ ᴡᴀʟᴋs ᴘᴇʀ ᴅᴀʏ =7.5 ʜʀs
ʜᴇ ᴡᴀʟᴋs ɪɴ 3 ᴅᴀʏs= 7.5×3=22.5 ʜʀs
ᴀɴᴅ ʜᴇ ᴛʀᴀᴠᴇʟʟᴇᴅ 65ᴋᴍ ɪɴ ᴛʜᴇsᴇ 22.5ʜʀs
sᴏ ᴛʜᴇ sᴘᴇᴇᴅ = ᴅɪsᴛᴀɴᴄᴇ / ᴛɪᴍᴇ 
=65/22.5 =2.88 ᴋᴍ/ʜ
sᴘᴇᴇᴅ ᴏғ ᴛʜᴇ ᴍᴀɴ ᴡɪʟʟ ʀᴇᴍᴀɪɴ sᴀᴍᴇ,
sᴏ ᴛɪᴍᴇ = ᴅɪsᴛᴀɴᴄᴇ/sᴘᴇᴇᴅ 
= 156/2.88 = 54 ʜʀs
ᴇᴠᴇʀʏᴅᴀʏ ʜᴇ ᴡᴀʟᴋs 8ʜʀs, sᴏ ғᴏʀ 54 ʜʀs, ʜᴇ ʜᴀs ᴛᴏ ᴡᴀʟᴋ 54/8 = 6.75 ᴅᴀʏs