Question

at 12 km per hour ?
29. A man went 280 km in 9 hours. He went
some distance by bus at the rate of 20 km/
hour and the rest by train at the rate of 40
km/hour. How far did he go by bus ?​

Answer 1

Answer:

80km by bus

Step-by-step explanation:

If he goes by bus

speed=20km/h. let time taken=X hours

then, distance travel by bus=20×X=20Xkm---(1)

If he goes by train

speed=40km/h. let time taken=Y hours

then, distance travel by train=40×Y=40Ykm---(2)

Total distance =280

then,from equ. (1) and (2)

20X+40Y=280---(3)

and total travel time=X+Y=9---(4)

by solving equ. (3) and (4) we get

X=4 and Y=5

put value of X and Y in equ. (1) and (2) we get

distance travel by bus=20X

=20×4

=80km

and by train=40Y

=40×5

=200km