250 മീറ്റർ, 320 മീറ്റർ നീളമുള്ള എതിർ ദിശയിൽ സഞ്ചരിക്കുന്ന രണ്ട് തീവണ്ടികളുടെ വേഗത മണിക്കൂറിൽ 60 km , 50km ക്രമത്തിലാണ് . രണ്ടും പരസ്പരം കടന്നുപോകാൻ എത്ര സമയം വേണ്ടിവരും ?
A16.8 sec
B17.8 sec
C18.1 sec
D18.6 sec
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