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:1) 6000km/h

Step-by-step explanation:

Answer 2

1. => Speed of train = 300/18 x 18/5 = 60 km/hr.
2. ∴ Speed of man (x) = 60 km/hr and speed of downstream = 75 km/hr. ∴ Speed of stream = 15 km/hr. Hence upstream speed = 60 – 15 = 45 km/hr. So time taken to cover 20 km = 20/45*60 = 26.67min.

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