Alex swims at an average speed of 45 m/min. How far does he swim in 1 min 24 sec?

d = 63 m

Explanation:

Speed of Alex is 45 m/min.

We need to find distance he swim in 1  in 24 sec

45 m/min =0.75 m/s

Time, 1 min 24 sec = 84 sec

Speed = distance/time

Distance, d = v × t

d = 0.75 m/s × 84 s

d = 63 m

So, he will cover a distance of 63 m.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .