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1. A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is --
- A. 66 km/hr
- B. 66 km/hr
- C. 66 km/hr
- D. 66 km/hr
Answer: Option D
Explanation:
ধরি, দ্বিতীয় ট্রেনটির গতি x km/hr
6/60× 60 = (108/1000) + (112 /1000) / x + 50
1/600 = ( 220/1000) / x + 50
1/600 = 22/100( x + 50)
1/6 = 22/ x + 50
x + 50 = 6 × 22
x = 132 - 50
x = 82
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