The distance between P and Q be 4 Kms and the distance between U and V be 5 Kms. If a car C1 travels from P and Q at a speed of S1 and another car C2 travels between U and V at a speed of S2. Now what should be the minimum speed of C2 so that it reaches in time or before C1.
Time = distance/speed.Assume T1 be the time taken by C1 to reach its destination and let T2 be that of C2.
T1 = 4/S1 and T2 = 5/S2
For T2 to be lesser than that of T1. 5/S2 < 4/S1 OR s2 > (5/4)S1
Hence speed of car C2 should be at least or greater than 5/4th of speed of car C1.
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