14. A bus crosses two people cycling at the speed of 9.6
km/hr and 12 km/hr in the same direction as that in
which the mini van is heading in 4.5 seconds and 9
seconds respectively. What is the length of the bus ?
(A) 7 m
(B) 6 m
(C) 4 m
(D) 8 m
Answers
Answered by
0
Answer:
(c) 4m
Step-by-step explanation:
let speed of bus=x
speed of cycle 1 (c1)=9.6km/hr =9.6×1000/3600 m/s
speed of cycle 2(c2)=12 km/hr= 12×1000/3600 m/a
time taken by bus to cover cycle 1 = 4.5 sec
time taken by bus to cover cycle 2 =9 sec
relative speed of bus with cycle 1= x-c1
relative speed of bus with cycle2= x-c2
now,
length of bus,
(x-c1)×4.5=(x-c2)×12
(putting all values in the eqn. we will get the value of x)
here x= 4m
Answered by
1
Step-by-step explanation:
Bus Speed is A
(A-9.6)*4.5=(A-12)*9
so A=14.4 km
train length relative speed
(14.4-9.6)5/18*4.5
6m
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