*Four* *friends* **A**, **B**, **C**, **D** need to cross a bridge.

A **maximum** of **2** peoples can cross at a time.

It is night and they have just **1** **lamp**.

People that cross the bridge **must** **carry** the **lamp** to see the way.

A pair must walk together at the **speed** of **slower** **person**.

Speeds of

*A*: **1** *minute* to cross bridge.

*B*: **2** *minutes* to cross bridge.

*C*: **7** *minutes* to cross bridge.

*D*: **10** minutes to cross bridge.

What is the *total* *minimum* *time* (in minutes) required by all 4 friends to cross the bridge ?

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