What is it with the name Sara these days!? XD

1 answer:

Komok [63]3 years ago

7 0

66 mph

Explanation:

Average speed is the rate of change of distance with time:

Average speed = $\frac{Distance }{time}$

Given parameters:

Starting point = 88mile marker

End of journey = 121mile marker

time = 30minutes = 0.5hr(60min = 1hr)

Solution:

The distance covered in this journey:

Distance = End of journey - starting point = 121 mile - 88 mile = 33mile

Average speed = $\frac{33miles}{0.5hr}$

= 66mph

The average speed of Sara's mum is 66mph

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#learnwithBrainly

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QveST [7]

Lower the melting point

Explanation:

Salts helps to melt road by lowering the melting point. It acts as an impurity and generally, impurities low the melting point of substances.

Salts are used as an antifreeze.

Water freezes at 0°C and forms ice/snow which can impede human and vehicular movement.
When salt is added, it causes the depression of the freezing point by lowering it further.
The freezing point is pegged back at -6°C.
This way it takes more low temperature to freeze the water.
The salt acts as an impurity and causes the depression of melting point and widening of the melting range.

learn more:

#learnwithBrainly

8 0

4 years ago

borishaifa [10]

Answer:

162.349

Explanation:

(.3060 * 159.37) + (.1579 * 162.79) + (.5361 * 163.92) = 162.349