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3 years ago

A train travels 77 kilometers in 1 hour, and the 66 kilometers in 1 hour. What is the average speed?

1 answer:

6 0

Average speed = (total distance covered) / (time to cover the distance)

Total distance = (77km + 66km) = 143 kilometers

Time to cover the distance = 2 hours

Average speed = (143 km) / (2 hours) = 71.5 km per hour

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A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 29 km2. What mass of water fell on the town? One cubic m

Alexus [3.1K]

Answer:

The mass of water is $1.7661\times10^{9}\ kg$

Explanation:

Given that,

Area of town = 29 km²

Time = 30 min

Height = 2.4 inch

Mass = 103 kg

We know that,

1 m = 39.37 inch

So, $2.4\ inch =\dfrac{2.4}{39.37}$

$2.4\ inch=0.0609\ m$

We need to calculate the volume

Using formula of volume

$V=H\times A$

Put the value into the formula

$V=0.0609\times29\times1000^2$

$V=1766100\ m^3$

We need to calculate the mass of water

Using formula of density

$\rho=\dfrac{m}{V}$

Put the value into the formula

$1000=\dfrac{m}{1766100}$

$m=1000\times1766100$

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Hence, The mass of water is $1.7661\times10^{9}\ kg$

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