The Speed Distance and Time trick No Ads

G'day and welcome to Xcelerate Maths. In this lesson we're going to learn the speed, distance and time rules and how to apply them to real life. To remember the three rules, let's use DST triangle. Notice that the and are in alphabetical order. First let's find the distance rule. Highlight the Because the and are alongside each other we'll multiply so distance equals speed multiplied by time. Now let's use the triangle to find the speed rule. Okay, highlight the Because the is above the we divide. Speed equals distance divided by time. Now for the third rule to find the time. Highlight the in the triangle. Because is above the we'll divide. So the time equals distance divided by speed. Easy to remember? Now let's test you out. Let's find the distance. car travels at speed of 100 km/h for 4 hours. How far does it travel? Hey, remember the DST triangle? Distance equals speed multiplied by time. The speed is 100 km/h and the time is 4 hours, so when we multiply them the distance equals 400 km. In the second example, let's find the speed. An express train travels 1500 km in 3 hours. How fast does it travel? Okay here's the DST triangle. Speed equals distance over time. We know the distance is 1500 km and we know the time is 3 hours. So the speed is super fast 500 km/h. Now let's do an example to find the time at snail's pace. snail moves 80 at speed of 10 mm/s. How long does this take? From the DST triangle the rule is time equals distance divided by speed. That's distance of 80 divided by speed of 10 mm/s. That gives time of 8 seconds for the snail to slime across my foot. Alright here's challenge question. snake can attack you in 0.2 seconds if you are 3 away. How fast is that? Speed equals distance over time. The distance is 3 The time is 0.2 seconds. So the snake's speed is 15 m/s. And now for the last challenge. The distance from the earth to the moon is 384,000 km. If rocket travels at constant speed of 7 km/s in direct path, how long would the journey take? Time equals distance over speed. The distance is 384,000 km. The speed is 7 km/s. So the answer is 54,914 seconds. But then we need to divide by 60 to change seconds to minutes. And then we need divided by 60 again to change minutes to hours. The final answer then is 15.25 hours for rocket to travel from the earth to the moon. Like and subscribe. Thanks for watching!