Help i dunno the answer to it :

5 miles per hour

Step-by-step explanation:

Let the speed of Kelly is miles per hour and speed of Raul is v₂ miles per hour.

Since, speed =

Kelly took 135 minutes to cover 90 miles from New York to Philadelphia.

∵ 1 minute = hours

∴ 135 minutes = = hours

v₁ =

   =

   = 40 miles per hour

Raul took 153 minutes to cover the same distance as Kelly,

∵ 1 minute = hours

∴ 153 minutes = = hours

v₂ =

    = 35.29

    ≈ 35.3 miles per hours

v₁ - v₂ = 40 - 35.3

         = 4.7

         ≈ 5.0 miles per hours

Therefore, Kelly is 5 miles per hours faster than Raul.     

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation: