Question

1) If a train A, 300m long crosses a bridge of length 200 m in 30 sec, then the speed of the train (in km/hr) is?


2) Speed of the boat in still water is 20 km/hr and the speed of the stream is 15km/hr. Find the total time taken to travel a distance of 30 km upstream and 50 km downstream??

3) If 243 is the third proportion
of a and b, where b:a = 9:1, then find the value of a and b.


I only need the answer..... Pls pls pls tell me faaaast...!!!....​

Answer 1

Answer:

Its answer will be 200 km please mark me as brain list.

Answer 2

Answer:

1 ) 60

2)up 6 hrs down 10/7 hrs total 52/7 hrs

3) a=3 b=27