Question: 16 -

Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph. At what time will they meet? 

10.30 a.m.

10 a.m.

9 a.m.

11 a.m.

Answer:

10 a.m.

Solution:

Suppose they meet x hours after 7 a.m. 

Distance covered by A in x hours = 20x km. 

Distance covered by B in (x - 1) hours = 25(x - 1) km. 

Therefore 20x + 25(x - 1) = 110 

45x = 135  

x = 3. 

So, they meet at 10 a.m.

Question: 17 -

A train running at the speed of 60 km/hr crosses a pole in 9 seconds. Find the length of the train. 

135 m

140 m

145 m

150 m

Answer:

150 m

Solution:

Speed = 60*(5/18) m/sec = 50/3 m/sec 

Length of Train (Distance) = Speed * Time 

(50/3) * 9 = 150 meter

Question: 18 -

A train is 360 meter long is running at a speed of 45 km/hour. In what time will it pass a bridge of 140 meter length? 

40 sec

50 sec

20 sec

30 sec

Answer:

40 sec

Solution:

Speed = 45 Km/hr = 45*(5/18) m/sec = 25/2 m/sec

Total distance = 360+140 = 500 meter 

Time = Distance/speed 

= 500 * (2/25) = 40 seconds

Question: 19 -

A 1200 m long train crosses a tree in 120 sec, how much time will I take to pass a platform 700 m long? 

180 sec

175 sec

190 sec

170 sec

Answer:

190 sec

Solution:

L = S*T 

S= 1200/120

S= 10 m/Sec.

Total length (D)= 1900 m

T = D/S

T = 1900/10

T = 190 Sec 

Question: 20 -

ow many seconds will a 500 meter long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr? 

25 sec

35 sec

30 sec

28 sec

Answer:

30 sec

Solution not available.