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If Vinay had run at a speed of 2 km/h faster, he would have taken 10 minutes less to cover 4 km, find the speed of Vinay?A. 7 km/hB. 5 km/hC. 4 km/hD. 6 km/h1. D2. B3. C4. A |
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Answer» Correct Answer - Option 1 : D Given: Distance = 4 km Formula used: Distance = {(Speed1 × Speed2)/(Speed1 - Speed2)} × time difference Calculation: Let the speed be 'S'. Distance ⇒ Distance = {[S × (S + 2)]/2} × (10/60) ⇒ 4 = {[S × (S + 2)]/2} × (10/60) ⇒ S2 + 2S = 48 ⇒ S = 6, -8 Speed can never be negative ⇒ S = 6 km/h ∴ The speed is 6 km/h. |
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