Thunder and lightning

There was a glimpse of the sky and we hear a thunder in 4.5 seconds. The light spreads at 300,000 kilometers per second, so we can assume the flash instantly without delay. However, the speed of the sound is much smaller in the air one third of a kilometer per second. How far away is the storm?

Correct result:

s =  1.5 km

Solution:

$$\begin{gathered} v=1\mathrm{/}3={\displaystyle \frac{1}{3}}\doteq 0.3333\text{ km/s } \\ t=4.5\text{ s } \\ s=v\cdot t=0.3333\cdot 4.5={\displaystyle \frac{3}{2}}={\displaystyle \frac{3}{2}}\text{ km}=1.5\text{ km} \end{gathered}$$

Try another example

Showing 0 comments:

Next similar math problems:

• Customary length
  Convert length 65yd 2 ft to ft
• A section
  A section of the boardwalk is made of 15 boards. Each board is 9 1/4 inches wide. The total width of the boardwalk is 144 inches. The spacing between each board is equal. What is the width of the spacing between the boards?
• The swallow
  The swallow will fly 2.8 km per minute. How many km will the swallow fly in one hour?
• Aircraft nose down
  How long will fall airliner from a height of 10000 m at speed 1,000 km/h?
• Pedestrian
  Dana started at 10:00 from the point A to point B. These points are distant 12 km. Determine how fast Daniel went when the place B arrived at 11:54. Speed express in km/h.
• Knight
  Knight passed 13 km long track in 26 minutes, what was his average speed?
• Train and walker
  Walker passes an hour 5 km. Express train per hour 100 km. Walker went 4 hours. How many minutes took the distance express train?
• Cyclist 9
  A cyclist travels at a a speed of 4.25 km per hour. At that rate, how far can he travel in 3.75 hours?
• Two cars 2
  Two cars started from two positions 87 km distant at the same time in opposite directions at speeds 81 km/h and 75 km/h. What was the distance between them after 2 hours 50 minutes of driving.
• Constant motion
  The car has undergone constant motion 120 km in 1 hour 30 minutes. Determine its average speed. Determine how long car drove in the first 20 minutes and 50 minutes from the start of the move.
• The cyclist
  The cyclist drove from A to B, 60 km away. The first half drove at 30km/h, the second at 20km/h. How long did it take for him?
• Two vans
  At 8:30 a. M. , two vans leave at a parking area. They travel in opposite directions: one van travels at 48 km/h and the other at 62 km/h. At what time will the cars be 550 km apart?
• Railroad
  The railroad runs parallel to the railway. The train travels at 36 km/h on track. In the opposite direction, the motorcycle rides at 90 km/h. The train passes in 3 seconds. How long is a train?
• Speeds
  George pass on the way to school distance 200 meters in 165 seconds. What is the average walking speed in m/s and km/h?
• Cyclist and car
  A cyclist who runs at a speed of 20km per hour will arrive at the finish in 4.5 hours. How fast does the car have to drive the same route in 2 hours?
• Car loop
  The toy car runs at an average speed of 2 m/s. In a minute, it will pass the entire circuit five times. How long is the loop?
• Speed of sound
  The average speed of sound is 330 meters per second. Estimate how long it will hear the church bell 1 km away. Calculate the distance from what would hear sound after 10 seconds.