Question

1. A train passes an electric post in 10 second and a bridge of
length 2 km in 110 second. The speed of the engine is:
(a) 18 kmph
(b) 36 kmph
(c) 72 kmph
(d) 90 kmph​

Answer 1

Answer:

C) 72kmph

Step-by-step explanation:

• x/10=(2000+x)/110

• 110x-10x = 20000
• x=20000/100
• x=200mtr (length of )

• 200/10=20m/sec
• 20m/sec = 20*18/5= 72 kmph