All categories

3 years ago

A train travels 70 kilometers in 4 hours, and then 55 kilometers in 3 hours. What is its average speed?

Mathematics

2 answers:

padilas [110]3 years ago

8 0

The average speed:

$v=\dfrac{total\ distance}{total time}$

We have

total distance = 70 km + 55 km = 125 km

total time = 4 h + 3 h = 7 h

The average speed:

$v=\dfrac{125\ km}{7\ km}\approx18\ \dfrac{km}{h}$

Naya [18.7K]3 years ago

6 0

Answer:

Distance = 70 + 55 = 125 kilometers

Time = 4 + 3 = 7 hours

Rate = Distance / Time

Rate = 125 / 7 = 17.8571428571 kilometers per hour

Step-by-step explanation:

You might be interested in

Rewrite in simplest terms. 4 (-6g - 10h) + 3h - 4 (- 3h - 10g)

kondor19780726 [428]

Answer: 16g - 25h

4 (-6g - 10h) + 3h - 4 (- 3h - 10g)

-24g - 40h +3h +12h +40g

16g - 25h

Step-by-step explanation:

if this is wrong im sorry

8 0

3 years ago

(b) The monthly salary of a staff working in a doll shop is Rs. 7,500. She sold the dolls of Rs. 1,20,000 in a month. If she ear

SSSSS [86.1K]

Answer:

Step-by-step explanation:

Let the rate of commission is x%.

<u>Total earning is:</u>

7500 + 120000*x/100 = 13500
1200x = 13500 - 7500
1200x = 6000
x = 6000/1200
x = 5

7 0

2 years ago

Read 2 more answers

Solve<br>2x + 5x - 11 = -46

irga5000 [103]

Answer:

Step-by-step explanation:

7x-11=-46

(7x-11)+11=-46+11

X = -5

5 0

3 years ago

How much heat is released when 12. 0 grams of helium gas condense at 2. 17 K? The latent heat of vaporization of helium is 21 J/

aleksandr82 [10.1K]

The amount of heat released when 12.0g of helium gas condense at 2.17 K is; -250 J

The latent heat of vapourization of a substance is the amount of heat required to effect a change of state of the substance from liquid to gaseous state.

However, since we are required to determine heat released when the helium gas condenses.

The heat of condensation per gram is; -21 J/g.

Therefore, for 12grams, the heat of condensation released is; 12 × -21 = -252 J.

Approximately, -250J.