First, find the acceleration using Newton's Second Law.

Where F = 8.10x10^5 N and m = 1.40x10^7 kg.
![a=\frac{8.10*10^5N}{1.40*10^7\operatorname{kg}}=5.79*10^(-2)\cdot(m)/(s^2)]()
Then, use a formula that relates acceleration, initial velocity, final velocity, and time.

Solve for t because the problem is asking to find the time.

Where vf = 64 km/h, v0 = 0, and a = 5.79x10^-2 m/s^2. Before we continue, we need to transform the final velocity to m/s.
![v_f=64\cdot(km)/(h)\cdot\frac{1000m}{1\operatorname{km}}\cdot(1h)/(3600\sec)=17.78\cdot(m)/(s)]()
Once we have the velocity transformed, we are able to find t.

But, the answer must be in minutes.

Therefore, it takes 5.12 minutes.