Veto q&a 7 Month22 (1)

Q
@hang out
2000 3
= = 2000 × = 48sec
125 125
3
Two trains, one from Howrah to Patna and other
from Patna to Howrah, starts simultaneously.
After they meet, the trains reach their destinations
after 9 hours and 16 hours respectively. The ratio
of their speed is?
Let the name of the trains be A and B
Then, (A’s speed) : (B’s speed) = b : a
= 16 : 9
= 4 : 3
If two trains (or bodies) start at same time from
points A and B towards each other and after
crossing they take a and b see in reaching B
and A respectively, then
A’s speed : B’s speed = b : a
Q Two goods train each 500 m long, are running in
opposite direction on parallel tracks. Their speed
are 45 km/h and 30 km/hr respectively. Find the
time taken by the slower tarin to pass the driver of
the fasterone
Relative speed = 45 + 30 = 75 km/h
5 125
= 75× = m/sec
18 6
Distance covered = 500 + 500 = 1000 m
Required time = Distance
Speed
1000 6
= = 1000 × = 48 sec
125 125
6
Q Two trains of equal length are running on parallel
lines in the same direction at 46 km/hr and 36 km/
hr. The faster train passes the slower train in 36
seconds. The length of the each train is
Let the length of the each train be ‘a’ meters
Then, distsance covered = 2a meters
Relative speed = 46 - 36
5 25
= 10 × = m/sec
18 9
2a
25
=
36 9
Q
Q
Q
25×
36
2a = = 100
9
a = 50 m
A train 108 m long moving at the speed of 50 km/hr
crosses a train 112 m long coming from opposite
direction in 6 seconds. What is the speed of the
second train is?
Let the speed of second train be ‘a’ meter
Relative Speed = (50 + a) km/hr
5
= (50 + a) x m/s
18
+
= 250 5 a m / s
18
Distance covered = 108 + 112 = 220 m
∴ Distance = Time
Speed
220
= 6
250 + 5a
⇒ 250 + 5a = 660
⇒ a = 82 km/hr
A man setting in a train which is travelling at 50 km/h
observes that a goods train, travelling in opposite
direction, takes 9 seconds to pass him. If the goods
train is 280 m long, find its speed
Relative speed =
= 62 km/h
280
9
m/sec
280 18
= × = 112 km/h
9 5
Speed of the goods train = 112 - 50
A train X speeding with 120 km/h crosses another
train Y, running in the same direction, in 2 minutes.
If the lengths of the trains X and Y be 100 m and
200 m respectively, what is the speed of train Y?
Let the speed of train Y be ‘a’ km/hr
Speed of ‘X’ relative to ‘Y’ = (120 - a) km/hr
5
= (120 − a) m / sec
18
600 − 5a = m / sec
18
Distance covered = 100 + 200 = 300 m
Distance =Time
Speed
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