Answer :
3 hours =180mins
marrisa 15,28,42,56,68,80,92,104,116,128,140,152,164,176,188,
john 15,45,75,105,145,175,205
stephanie 15,60,105,150,195
no there alarm didnt go at the same tiem after the first time
marrisa 15,28,42,56,68,80,92,104,116,128,140,152,164,176,188,
john 15,45,75,105,145,175,205
stephanie 15,60,105,150,195
no there alarm didnt go at the same tiem after the first time