Ratio of speeds
Two trains running in opposite directions cross the man standing upon the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is
A. 1 : 3
B. 3 : 2
C. 3 : 4
D. None of these
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In travelling from city A to city B, John drove for 1 hour at 50 mph as well as for 3 hours at 60 mph. What was his average speed for the whole trip?
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Three persons are walking from the place A to another place B. Their speeds are in ratio of 4 : 3 : 5. The time ratio to reach B by these persons will be
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