Zain goes swimming. He swims the first length of the pool in 2.5 minutes. The time he takes to swim each length is 10 seconds more than he took to swim the previous length.

Question

A. Find the time Zain takes to swim the fifth length.

B. Find the time taken for Zain to swim a total of 10 lengths of the pool.

Answer 1

2.5 min = 150 sec, so
A. 150+4*10
B. S10 = 10/2 (2*150 + 9*10)

Answer 2

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