Question

If a train maintains an average speed of 42 km per hour,it arrives at its destinations at the right time if however the average speed in 40 km per hour,it arrives 15 mi
nuten late,find the length of the journey?​

Answer 1

Answer:

210 km

Step-by-step explanation:

suppose the length of the journey is 42 km. and the avg speed is 40 km. then it will be late by 3mnts.bcz the train runs 40 km in 1hr/60 mnts

1 km in 60/40 = 1.5 mnt

2 km in 1.5*2 =3 mnt

now it will be A 3 mnt late if the journey length is 42

so i can say

3mnt late if length is 42km

1..............................is42/3 =14km

15mnt.....................is 14*15= 210km