I'm doing a traceroute from my box to ....say.... stackoverflow.com. I see a couple of instances where there are multiple ip's on one line. For instance, in below, line #2 has two IPs: 10.1.6.5 and 10.1.4.5

Also on line #4, there are two timestamps after 216.182.236.96: 0.653 ms and 0.637 ms

What are these? This is on Linux

Traceroute example:

traceroute to www.stackoverflow.com (198.252.206.16), 30 hops max, 60 byte packets
 2  ip-10-1-6-5.us-west-1.compute.internal (10.1.6.5)  0.329 ms  0.425 ms ip-10-1-4-5.us-west-1.compute.internal (10.1.4.5)  0.471 ms
 4  216.182.236.104 (216.182.236.104)  0.554 ms 216.182.236.96 (216.182.236.96)  0.653 ms  0.637 ms
 5  205.251.230.64 (205.251.230.64)  0.616 ms 205.251.229.232 (205.251.229.232)  1.305 ms 205.251.230.64 (205.251.230.64)  0.573 ms