dàgài yào duōjiǔ?
Approximately how long does it take to travel?
请打开后备箱。
Open the trunk please
This is a polite request: qǐng (please) + dǎkāi (open) + hòubèixiāng (trunk/boot). 'Dǎkāi' means 'to open' (literally 'hit-open').
请把后备箱打开
qǐng bǎ hòubèixiāng dǎkāi
Please open the trunk. — More polite with the 把 construction.
打开后备箱
dǎkāi hòubèixiāng
Open the trunk. — More casual without 请.
请打开后备箱。
qǐng dǎkāi hòubèixiāng
Please open the trunk.
好的,马上来。
hǎo de, mǎshàng lái
Okay, right away.
Appropriate
Avoid when
You say "请打开后备箱" (qǐng dǎkāi hòubèixiāng).
It is pronounced qǐng dǎkāi hòubèixiāng. Note that 后 (hòu) and 备 (bèi) are both fourth tone, while 箱 (xiāng) is first tone.
Use it when you need a taxi driver to open the trunk, typically to load or unload luggage. It is polite and standard in that situation.
Tomyo
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