A wave generator produces waves along an elastic strip. The waves travel at 2.4 m/s and the distance between neighbouring crests is 60 cm. What is the period of the wave?
0.25 s0.25\ \mathrm{s}0.25 s
25 s25\ \mathrm{s}25 s
1.4 s1.4\ \mathrm{s}1.4 s
4.0 s4.0\ \mathrm{s}4.0 s