# DCP-251: Journey By Circle Back to All Problems

Medium Math > Number Theory

Satalite_A and Satalite_B begin their journey respectively from mark A and mark B . ![enter image description here][1] The radius of inner circle is r1 and outer circle is r2. Velocity of both satellite is **π m.s-1**. You need to find the minimum time needed for Satalite_A and Satalite_B to come at initial position at the same time after the journey start.! Input: ------ Input starts with an integer **T (T <= 10000)** denoting the number of test cases. Next T lines contain 2 integer **r1, r2 (1 <= r1 < r2 <= 10^9)**. Output: ------- For each test case, output one line containing the expected answer.See the sample I/O. Sample Input ------------ 1 1 2 Sample Output ------------- 4 [1]: https://s3-ap-southeast-1.amazonaws.com/devskillimagestorage/questionimages/d34cdb7b-87b9-cae6-2a1d-08d45639741a_c871f3f5a3bd4dcba789d7ff05f3e89d_W261xH232.png

### Problem Limits

 Language Time Limit (seconds) C 0.50 C++ 0.50 C++14 0.50 C# 1.00 Go 1.00 Java 1.00 JavaScript 1.00 Objective-C 1.00 Perl 1.00 PHP 1.00 Python 1.00 Python3 1.00 Ruby 1.00 VB.Net 1.00

# 157/451

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