[YT] they are wrong,since the correct answer is 30 seconds.
let the tip of the tail of the train be the position 0m .
the total displacement of the tip is 130+320 = 450m
thus,the time of the total passing through the tunnel of the train = 450/15 = 30s
their concerts about the mathenatics or phyrics are not enough to handle these questions
[YT] there’s no need to add another 130 what. if starting from exactly the mouth of the tunnel, train will traverl 320 and another 130 of its own length. so it’s 450 what.
[YT] wa seh.. the guys @ 我愛黑澀棒棒堂..embarrassing sia..are they even graduates of secondary school or college or not..all tall and act shuai.. but brain is like coconut..haizz.. pity them sia.. this type nxt time 40+ 50+ useless alr..
[YT] siao.. 0:03 lik that the sound also can hear what is the name of the song.. cfm hong shi got hear b4 or see the answer..she also confess herself.. haizz cheat to win..pathetic
[YT] same.. i agree wif sanji4ever..
wth is this ‘bad penny always comes back’.. and FIRED BREAD STICK.. shud be FRIED.. and ‘STICK’ they pronounce as steak.. and ‘LEAVE’ pronounce as ‘leaf’..LOUSY SIA..their english cannot make it.. so many ppl go university there but sadly, is not recognised in countries that uses english as major language..