I’m pretty sure it’s 370 bc
1 and a half hours is 80+40 (40 is half of 80)
and 2 and a half hours, so 100 for each hour.
100+100+50= 250
250+120=370!!
answer : 370 kilometers per hour
√50 lies between 7 and 8.
4n+15=70+n
I'm pretty sure this is the answer
Have a good day!
7 is the right answer your looking for.
