![]() Right, but we’re still talking in minutes, so let’s convert it to seconds:ġ666.67m/minute / 60 seconds = 27.78metres per second (27.78m/s) We might now want to convert the kilometres into metres which can be done by multiple by 1000.ġ.66667km/minute * 1000 = 1666.67m/minute. If we divide it by 60, then we convert it to minutes We have 100km/h, but time unit is in seconds and the final answer is in metres. How far, in metres, do you travel in five seconds?Īgain, we have to make sure we’re talking about the same units. One more example: You’re travelling at 100km/h. or convert 255 minutes to a decimal hour by doing 255 minutes / 60 minutes = 4.25 hours, which gives us the figure we had before.convert kilometres per hour to kilometres per minute (70km/h / 60 minutes = 1.17km/min), therefore 1.7km/min * 255 minutes = 297.5km.It’s a good hint in an equation that if it looks wrong, it probably is. Let’s try it:ħ0km/h * 255 minutes = 17850 of some figure that makes no sense! You have to make sure you’re speaking in the same time units. Now, when we do the equation, it’s going to give us the wrong figure because our speed is in kilometres per hour, but our time is in minutes. Four hours in minutes is 4 * 60 = 240 minutes.Īdd the 15 minutes and we have 255 minutes. The other way around of doing this is converting the time into minutes. The first option is fairly simple: take the 15 minutes and divide it by 60 minutes so that we know what proportion of an hour 15 minutes is.Īdd that onto the 4 hours you already have and it’s 4.25 hours. You’re going to drive at an average of 70km/h for 4 hours.ĭistance is speed multiplied by time, so:Įasy so far, but what about if you’re going to be driving for 4 hours and 15 minutes? Now you either need to figure out how much 15 minutes is as a decimal number of hours, or you need to convert the hours figure into minutes and, at the end, convert it back. So, as long as we have a couple of those, we can plug them into one of the equations. ![]() There’s a simple formula which governs the three, and it can be expressed with either variable as the subject of the equation: These are often set as questions in maths tests but are useful for us to know so that we can approximate how long a journey will take.
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