One car moving on a straight road covers one third of the...

Transcript

00:01 In this question, k1 data is that is saying that one car moving on a straight road covers one -third of the distance with 20 km per hour.

00:13 So if i consider that that is total distances, so that is equal to d, then the one -third of distance d unit is that is kilometer.

00:32 So the one -third, that means d over three.

00:35 So that distance is covered with speed that is we want so that is given 20 kilometer per hour and now the question for the same day the rest with that is given 60 kilometers covered with speed that is given so that is 60 km per hour so the rest distance will be that is total distance is d so subtract d over 3 from d so remaining will be that is 2d over three kilometer distance so for that distance the speed is given in the question so that is v2 so that is equal to 60 km per hour so now in the question it is asking that we have to find average speed so this is the question is given and now i will give here answer so here i will say that use the relation that is we know that between the distance time and speed so relation is that is speed that will be equal to distance divided by time so by with the help of this relation i will trying to find the first the value of time t so for covering this d over 3 kilometer distance so time t1 that will be equal to that is here i can state time will be written as that is equal to distance divided by speed so distance will be that is d over 3 divided by speed speed is that is v1 so that is 20 km per hour so t1 that will be written as that is so that will be written as that is d divided by 3 multiplied by 60 so that is sorry 3 multiplied by 20 so that is 60 so i will get day over 30 60 hour so this is the value of t1 for covering this d over 3 distance now i will try to find the distance time t2 for the distance that is 2d over 3 kilometer so that will be equal to t2 that will be tn as this distance divided by time sorry speed so distance is that is 2d over 3 divided by speed will be that is v2 so that is given 60 so simplify it then i will get that is t2 that will be equal to d over that is 90 hour so now after getting the value of t1 and t2 the average speed so that will be written as we know that average speed so that is equal to total distance divided by total time so total distance which i had assumed so that is d kilometer so here i'm writing that is that is that is d divided by total time so that is equal to t1 plus t2 so now substitute here the value of t1 and t2 so it will be written as that is average speed so that is equal to d divided by t1 is that is d over 60 plus t2 is that is d over 90 so now simplify it and i will get the average speed so that is equal to that is 36 km per hour...

Question

One car moving on a straight road covers one third of the distance with 20 km/hr and the rest with 60 km/hr. The average speed is

Question

One car moving on a straight road covers one third of the distance with 20 km/hr and the rest with 60 km/hr. The average speed is

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