Jim has answered 7 e-mails this is 35% of the e-mails he must answer how many emails does he need to answer?

He needs to answer 20 emails.

Step-by-step explanation:

Given : Jim has answered 7 e-mails .  (1)

This  is 35% of the e-mails he must answer .

We can write 35% as 0.35.

Let x be the number of emails  he need to answer.

Then, Number of mails he has answered = 0.35x  (2)

From (1) and (2), we have

Hence, he needs to answer 20 emails.

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m