Question: in what time will a train 140 meters long cross an electric pole , if its speed is 210 km / hr
A) 5 seconds
B) 4.5 seconds
C) 3 seconds
D) 2.4 seconds
E) none of these
Correct answer: D
Grade: 6 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 6.RP.A.3b