Question

two trains in two different towns
920 km apart are travelling at speed of 140 km per hour and 90 km per hour if both of the train left at 4:00 a.m. at what time will they pass each other​

Answer 1

Answer:

let after time 't' they will pass each other.So, distance covered by both the trains =140×t +90×t

now, sum of distance covered by both trains will be equal to total distance i.e 920 km. thus, 140t+ 90t = 920

or, 230t = 920

or, t = 4 hrs

hence at the time of (4+4) a.m = 8 a.m they will pass each other.