(1) According to this plan, the bus needs to travel 15*3=45km to send all the students.

Time 45÷60 = 0.75 hours,

That is to say, 0,75 * 60 = 45 minutes > 42 minutes, so we can't arrive on time.

(2) Let these students walk a certain distance. Assuming the distance is xh, the equation 5x+60x= 15*2 can be listed.

x=6/ 13=0.46

The distance traveled by students is 5x=0.46*5=2.3 1km.

The distance a car needs to travel is15-2.31=12.69 km, and the time it needs is 12.69÷60=0.2 1.

The total time is 0.46+0.2 1=0.67h, that is, 0.67*60=40.2 minutes < 42 minutes.

Therefore, students can wait for the bus to pick them up on foot.