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in Distance, Time and Speed by (239k points)
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Kaunal travels 50 km each day for four days with speed 25 km/h, 35 km/h, 20 km/h, and 45 km/h respectively. Find the average speed of Kunal approximate
1. 28 km/h
2. 35 km/h
3. 50 km/h
4. 20 km/h
5. 39 km/h

1 Answer

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Best answer
Correct Answer - Option 1 : 28 km/h

Given:

Different speeds of Kunal: 25 km/h; 35 km/h, 20 km/h and 45 km/h

Distance covered by Kunal in 4 days = 50 km

Formula used

Speed = Distance/Time

Calculation:

Total distance travelled = 50 × 4 = 200 km

Total time taken = (50/25) + (50/35) + (50/20) + (50/45) = (887/126) hours

⇒ 2 + (10/7) + (5/2) + (10/9) hours

⇒ (252  + 180 + 315 + 140)/126 hours

⇒ 887/126 hours

Average speed of Kunal = 200 ÷ (887/126)

⇒ 28.41 km/h ≈ 28 km/h

∴ Average speed is 28 km/hr (approx)

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