The speeds of A and B are in the ratio 3 : 4. A takes 20 min

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RRB ASM Exam (Ajmer) 2007 click here to view all questions

The speeds of A and B are in the ratio 3 : 4. A takes 20 min more than B to reach a destination. In what time does A reach the destination?

A

B2 h

C

D

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Answer is : $1\frac{1}{3} h$ Ratio of speed = 3:4; Ratio of time taken = 4:3 (distance remains constant.) Let time taken by A and B be 4x and 3x hour respectively. Then, $4x-3x = \frac{20}{60};$ $=> x = \frac{1}{3};$ Hence, time taken by A = 4x $= 4*\frac{1}{3} = 1\frac{1}{3} hours.$ Nithin K ? answered Nov 20 '2016 at 19:6 All Comments

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