C-05-Q081: A car covers part of $240$ km at $60$ km/h and the rest at $40$ km/h, … | প্রশ্ন করি

C-05-Q081mediumsingle_mcq

A car covers part of $240$ km at $60$ km/h and the rest at $40$ km/h, total time $5$ hours. Distance at $60$ km/h is—

Let $x$ km be covered at $60$ km/h: $\tfrac{x}{60}+\tfrac{240-x}{40}=5$ ; multiplying by gives , so . Thus km is travelled at km/h.

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150

150

150

40240−x=

120

2x+3(240-x)=600

x=120

120

60