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There are two parallel streets each dire...

There are two parallel streets each directed North to South. A person in the first street travelling from South to North wishes to take the second street which is on his right side. At some place, he makes a `150^(@)` turn to the right and he travels for 15 minutes at the speed of 20 km/hr. After that he takes a left: turn of `60^(@)` and travels for 20 minutes at the speed of 30 km/hr in order to meet the second street. What is the distance between the two streets?

A

7·5km

B

10·5 km

C

12·5 km

D

15 km

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