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Standard VII

Mathematics

Average Speed

Rahul and Chu...

Question

Rahul and Chunky starts together from Delhi in their own cars for Shimla. Rahul drives at an average speed of $60 k m / h$ and reaches Shimla in $9 h o u r s$ . If Chinky drives at an average speed of $54 k m / h$ how much time will he take to reach Shimla?

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Solution

Rahul & Chunky
$R \to 60 k m / h r 9 h$
$C \to 54 k m / h r (9)$
$\to$ Average speed = $\frac{d i s t a n c e}{t i m e}$
$∴ 60 k m / h r = \frac{d}{9 h r}$
$∴ d = 60 \times 9 = 540 k m$
$\to$ speed of chunky = $\frac{d i s t a n c e}{t i m e}$
time = $\frac{540}{54} = 10 h r$

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Rahul and Chunky starts together from Delhi in their own cars for Shimla. Rahul drives at an average speed of 60 km/h and reaches Shimla in 9 hours. If Chinky drives at an average speed of 54 km/h how much time will he take to reach Shimla?

Rahul & ChunkyR→60km/hr9hC→54km/hr(9)→ Average speed = distancetime∴60km/hr=d9hr∴d=60×9=540km→ speed of chunky = distancetimetime = 54054=10hr

Rahul and Chunky starts together from Delhi in their own cars for Shimla. Rahul drives at an average speed of $60 k m / h$ and reaches Shimla in $9 h o u r s$ . If Chinky drives at an average speed of $54 k m / h$ how much time will he take to reach Shimla?

Rahul & Chunky
$R \to 60 k m / h r 9 h$
$C \to 54 k m / h r (9)$
$\to$ Average speed = $\frac{d i s t a n c e}{t i m e}$
$∴ 60 k m / h r = \frac{d}{9 h r}$
$∴ d = 60 \times 9 = 540 k m$
$\to$ speed of chunky = $\frac{d i s t a n c e}{t i m e}$
time = $\frac{540}{54} = 10 h r$