ICSE Class 7 Answered
Hi
Please send the solution
Asked by Bovanghai | 04 May, 2019, 05:19: PM
Expert Answer
Let us assume that their elevator cross each other after x minutes.
then, 11 + 57x = 51 - 63x
→ 120x = 40
→ x = 1/3
Number of floors covered by David in 1/3 mins = 1/3× 57 = 19
Therefore their elevator cross each other at 11 + 19 = 30th floor
Answered by Yasmeen Khan | 05 May, 2019, 04:13: PM
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