a certain number of buses travel from city a to city b in an interval of 10 minutes at a speed 45 km h the distance between the cities is 180 km.vivek starts from b to a and travels at a speed of 36 km h. At minimum how many buses cross him till he reach at b
Answers
Answered by
0
18 buses...should cross
Answered by
0
Ans:
Lets vivek start at B at t=0
the first bus start from A at t=0
from conditions , let x be the distance at which vivek and the first bus meets.
so the time 't' will be same for both at the first meeting point
vivek, 36*t= x
1st bus 45*t=(180-x)
on solving above two we get,
t=20/9, x= 80
total time for vivek,=180/36=5hrs
so for vivek the remaining 100 kms are to be travelled by (total time taken by vivek - 'x'), = 5 - (20/9) = 25/9 hrs
convert to mins, (25/9)*60 = 500/3=166.66
for every 10 mins buses travel, so number of buses are, (166.6/10)=16+first bus= 16+1=17
Similar questions