In our camp there are 10 soldiers, four of them run at the speed of 7.2 km/hr., 3 at 5.4 km/hr, and another three at 3.6 km/hr. Seeing the liquid missile the soldiers are asked to vacate the camp. Because of the hilly area, the soldiers have to essentially stop for 2 seconds for breathing, after every 30 seconds of run. The missile can kill all life upto exactly 420 m from the camp. Assuming that the missile will exactly hit our camp, answer the following:
How many soldiers will survive, if the missile hits in exactly five minutes?

Options

A. All 10
B. Four
C. Seven
D. None

Answer

C