Approximate speeds of sound are: in air v1≈340m/s, in water v2≈1500m/s, and in iron v3≈5000m/s. A bell rings inside an iron pipe 1700m long that lies straight on the ground. At the same instant, an identical bell rings in open air 340m away from a student. Which bell’s sound will reach the student first?
(a) Both sounds reach at the same time
(b) The bell inside the iron pipe
(c) The information is insufficient to decide
(d) The bell in the open air