Question

Please solve these questions

Answers :
17. (i) 3 s
(ii) 2.5 s
18. (i) 24 s
(ii) 18 s
19. (i) 102 m
(ii) 102 m
20. (i) 90 m
(ii) 54 km/h
21. (i) 130 m
(ii) 42 km/h​

Answer 1

Answer:

17.i) Let the length of bridge be x m

length of train = 25m

distance covered by train = (25+x) m

speed = 30km/h => 30×5/18 => 25/3 m/s

time taken = 36 s

we know that ,

speed=distance/time  

distance = Speed × time  

25+x = 25/3×36

x = 300-25 => 275m