Two lasers are shining on a double slit, with slit separation d$.$ Laser $1$ has a wavelength of d$/20,$ whereas laser $2$ has a wavelength of d$/15.$ The lasers produce separate interference patterns on a screen a distance $4\mathrm{.}80$ m away from the slits.

Which laser has its first maximum closer to the central maximum?

What is the distance between the first maxima $($on the same side of the central maximum$)$ of the two patterns?

What is the distance between the second maximum of laser $1$ and the third minimum of laser $2,$ on the same side of the central maximum?