Question

UT US
Q.11. A train passes two bridges of lengths 200m and 120
min 29 sec and 21 sec respectively. What is the length
of the train , if the train is running at the same speed
over both the bridges?
1) 80m
2) 90m
3) 100m
4) 110m
5) None of these​

Answer 1

let lenth of train ve x

then

(200+x)/29=(120+x)/21

8x= 720

x= 90 meter ans