The speed-density $(u-k)$ relationship on a single lane road with unidirectional flow is $u=70-0.7 k,$ where $u$ is in $\mathrm{km} / \mathrm{hr}$ and $k$ is in veh $/ \mathrm{km} .$ The capacity of the road (in veh/hr) is

The speed-density $(u-k)$ relationship on a single lane road with unidirectional flow is $u=70-0.7 k,$ where $u$ is in $\mathrm{km} / \mathrm{hr}$ and $k$ is in veh $/ \mathrm{km} .$ The capacity of the road (in veh/hr) is

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