Spring tides occurred at two of the times shown. which two? how do you know?

May someone me with these science questions

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.