Question

two stinky A and B of the same length are made up of two different materials the time taken by 20 pulses to travel in both of them are 70 seconds and 90 seconds respectively in which slinky the pulse travels faster and why

Answer 1

20 pulses in slinky A took. 70 seconds
20 pulses in slinky B took 90 seconds

therefore pulse in slinky A is faster than in slinky B


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Answer 2

slinky A will be faster than slinky B because both cover equal distance but slinky a covered 20 pulses in 70 second which slinky B has taken