SOLUTION: Elena bicycles 8km/h faster than Dennis. In the same time it takes Dennis to bicycle 42km/hr, Elena can bicycle 66km/hr. How many km/hr does Dennis bicycle. How many km/hr does El

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Question 619264: Elena bicycles 8km/h faster than Dennis. In the same time it takes Dennis to bicycle 42km/hr, Elena can bicycle 66km/hr. How many km/hr does Dennis bicycle. How many km/hr does Elena bicycle.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The problem is misstated. 42 km/hr should be 66 km and
66 km/hr should be 66 km.
With that understood,
Let +t+ = the time it takes Dennis to bicycle 42km
+42%2Ft+ = Dennis's speed
+42%2Ft+%2B+8+ = Elena's speed, and
+66%2Ft++ = Elena's speed also
----------------------
+42%2Ft+%2B+8+=+66%2Ft+
+42+%2B+8t+=+66+
+8t+=+24+
+t+=+3+
+66%2Ft+=+66%2F3+
Elena's speed is 22 km/hr
------
check:
Dennis's speed = +42%2F3+
+42%2F3+ = 14 km/hr
OK