A Student walks 2 km in 30 minutes

1 km / 15min

Explanation:

The average speed is calculated by simply doing space divided by time so:

2km / 30min that becomes 1km / 15min

Have a good day.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;