56*(4+15/60)
56*(240+15)/60
56*(255)/60
238 miles
If i understood the question right, you're trying to find the value when h = -2. If that's true so here is how it's done:

6000N
reason: according to Newton’s second law of motion, Force = Mass x Acceleration
using this, multiply 2000 by 3 to get 6000
Answer:
distance covered in 2 hours = 80 km
distance covered in 1 hour = 80÷2 = 40 km
distance covered in 7/2 hours = 40 × 7/2
= 140 km
(3 1/2hours = 7/2 hours)
1st: add 5 to each side
2nd: divide by 2 on each side