Four persons started to do a work together ' A ' works only in starting two days after that B,C and

Four persons started to do a work together. ' A ' works only in starting two days after that B,C and D works alternatively starting from B. Ratio of time taken by A, B, C and D if they work alone is 4:3:2:5. If the work is completed in 12 days then in how many days A and C can complete the work if they work together?
चार व्यक्ति एक साथ एक काम करना शुरू करते हैं। ए' केवल दो दिनों के बाद काम करता है, उसके बाद बी, सी और डी वैकल्पिक रूप से बी से शुरू करते हैं। ए, बी सी और डी द्वारा लिए गए समय का अनुपात यदि वे अकेले काम करते हैं तो 4:3:2:5 है। यदि कार्य 12 दिनों में पूरा हो जाता है, तो A और C मिलकर कार्य को कितने दिनों में पूरा कर सकते हैं?
(a) 7.5 (b) 4.5 (c) 9 (d) 8
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