1.

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

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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