A running man crosses a bridge of length 500 meters in 4 minutes. At what speed he is running?

Question	A running man crosses a bridge of length 500 meters in 4 minutes. At what speed he is running?
Type	multiple_choice
Option	8.5 km/s	incorrect
Option	7.5 km/s	correct
Option	9.5 km/s	incorrect
Option	6.5 km/s	incorrect

Solution

Speed =⁵⁰⁰⁄₂₄₀=²⁵⁄₁₂m/s

We need answer in km/hr: Speed in km/hr=²⁵⁄₁₂*¹⁸⁄₅=⁹⁰⁄₁₂⟶³⁰⁄₄= 7.5 km/s

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