SSC CGL 6 06 2019 Shift 2 Paper

Question : 74 of 100

Marks: +1, -0

A and B are travelling towards each other from the points P and Q respectively. After crossing each other, A and B take

6 1/8

hours and 8 hours, respectively, to reach their destinations Q and P, respectively. If the speed of B is 16.8 km/h, then the speed (in km/h) of A is:

Solution:

\ {t}_{1}=\ {49}/{8}

\ {t}_{2}=8

\ {s}_{1}=?

\ {s}_{2}=16.8

\ {s}_{1}=\ {s}_{2} \√{\ {\ {t}_{2}}/{\ {t}_{1}}}

=16.8 \×\√{\ {8 \×8}/{49}}

=16.8 \×\ {8}/{7}=\ {134.4}/{7}

=19.2 \ {\km} \/ \ {h}

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