Question

17. A train contains 10 buses each 15m long moves from North to South

with speed of 72km/hr. Simultanously a bird is moving from south to

north with speed of 10m/s. How much time the bird takes to cross the

train?

(a) 50sec (b) 10sec (c) 15sec

(d) 20sec (e) 5sec ??
ans with solution​

Answer 1

Answer:

Relative velocity of the parrot w.r.t. the train [10−(−5)]=(10−(−5))m/s=15m/s

Time taken by the parrot to cross the train

=

15

150

=10s.