Chinese, asked by dainvincible1, 1 year ago

The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 km in 4 hours, then the speed of the first train is:

Answers

Answered by ReetChauhan1112
4
let speed of first train=x
speed of second train=400/4=100km/hr

ratio=7:8=7/8

ATQ,
x/100=7/8
x=7×100/8
x=7×25/2
x=175/2
x=87.5km/hr

so, speed of first train=87.5km/hr

ReetChauhan1112: hope it helped
ReetChauhan1112: mark as brainiest
Answered by Anonymous
2
the speed of the first train is 87.5 km/hr


Let the speed of two trains be 7x and 8x km/hr.

Then, 8x =400/4= 100

 x =100/8= 12.5

 Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.


dainvincible1: explain
Similar questions