The speed-of a car is 18m-s- Express this speed in km-h-70 km-hr-64-8 km-hr-76 km-hr-65-7 km-hr-

The correct option is B 64.8 km/hr 1m/sec = 1/1000km/1/3600hr ∴ 1 m/sec= 3.6 km/hr ∴ 18 m/sec= 18 × 3.6 km/hr = 64.8 km/hr Thus, the speed of the car is ...

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Standard VII

Mathematics

Units of Speed

The speed of ...

Question

The speed of a car is 18m/s. Express this speed in km/h.

70 km/hr

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64.8 km/hr

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76 km/hr

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65.7 km/hr

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Solution

The correct option is B
64.8 km/hr

$1 \frac{m}{s e c} = \frac{\frac{1}{1000} k m}{\frac{1}{3600} h r}$

$∴ 1 \frac{m}{s e c} = 3.6 \frac{k m}{h r}$

$∴ 18 \frac{m}{s e c} = 18 \times 3.6 \frac{k m}{h r}$

$= 64.8 \frac{k m}{h r}$

Thus, the speed of the car is 64.8 km/hr.

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The speed of a car is 18m/s. Express this speed in km/h.

The correct option is B 64.8 km/hr 1msec=11000km13600hr ∴1msec=3.6kmhr ∴18msec=18×3.6kmhr =64.8kmhr Thus, the speed of the car is 64.8 km/hr.

The correct option is B
64.8 km/hr

$1 \frac{m}{s e c} = \frac{\frac{1}{1000} k m}{\frac{1}{3600} h r}$

$∴ 1 \frac{m}{s e c} = 3.6 \frac{k m}{h r}$

$∴ 18 \frac{m}{s e c} = 18 \times 3.6 \frac{k m}{h r}$

$= 64.8 \frac{k m}{h r}$

Thus, the speed of the car is 64.8 km/hr.