Question

The distance between Del and Agra is 200km a train travels the first 100km at a speed of 50km/h how fast must the train travel the next 100km so as to average 70 km/h to the whole journey

Answer 1

Hey.......!!! here is ur answer....
Let the second speed is x
then according to the formula of average speed
A.S.= 2xy/x+y
where, x is the next speed and y is the given speed and A.S.= 70km/h
then ,
70= 2x*50/x+50
70x+3500=100x
30x=3500
x =3500/30km/h
I hope it helps u....!!!
Thank You.....☺️☺️☺️