Answer:
11. 1/5 + 2/3
1×3/5×3 + 2×5/3×5
3/15 + 10/15
12. 3/4 - 2/5
3×5/4×5 - 2×4/5×4
15/20 - 8/20
13. 1/2 + 3/4 + 1/3
1×6/2×6 + 3×3/4×3 + 1×4/3×4
6/12 + 9/12 + 4/12
14. 7/8 - 5/9
7×9/8×9 - 5×8/9×8
63/72 - 40/72
15. 5/12 + 2/3
5/12 + 2×4/3×4
5/12 + 8/12
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Verified answer
Answer:
11. 1/5 + 2/3
1×3/5×3 + 2×5/3×5
3/15 + 10/15
= 13/15 km (D)
12. 3/4 - 2/5
3×5/4×5 - 2×4/5×4
15/20 - 8/20
= 7/20 (A)
13. 1/2 + 3/4 + 1/3
1×6/2×6 + 3×3/4×3 + 1×4/3×4
6/12 + 9/12 + 4/12
= 19/12 hr or 1 7/12hr (B)
14. 7/8 - 5/9
7×9/8×9 - 5×8/9×8
63/72 - 40/72
= 23/72 (C)
15. 5/12 + 2/3
5/12 + 2×4/3×4
5/12 + 8/12
= 13/12 (C)