If two coins are tossed at the same time, what are all the possible outcomes? (for example, ht means getting heads on the first coin and tails on the second.)
a.
{ht, th, tt}
b.
{hh, ht, tt}
c.
{hh, ht, th, tt}
d.
{hh, tt}

 The traveler's speed off the walkway= 3 ft/s

The speed of the moving walkway= 2 ft/s

Step-by-step explanation:

Given: A traveler is walking on a moving walkway in an airport.

Let 't' be the traveler's speed off the walkway and 'w' be the speed of walkway.

Then the traveler's ground speed against the walkway (t-w)= 1 ft/s

And the traveler's ground speed  with the walkway (t+w)= 5 ft/s

thus we get the following equations

Adding (1) and (2), we get

Subtract (2) from (1), we get

Therefore, the traveler's speed off the walkway= 3 ft/s

The speed of the moving walkway= 2 ft/s