Ajay walked at 10 kmph for certain part of the journey and then he took an auto for the remaining pa...........

Quantitative Aptitude ( CCS) Time & distance

Ajay walked at 10 kmph for certain part of the journey and then he took an auto for the remaining part of the journey travelling at 30 kmph. If he took 10 hours for the entire journey, what part of journey did he traveled by auto if the average speed of the entire journey be 18 kmph?

132 km

145 km

128 km

120 km

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Explanation:

Solution:
Total distance = 18*10 = 180
Journey traveled by auto = x hours
30 * x + (10-x )10 = 180
30x + 100 – 10x = 180
20x = 80
x = 4 hours
Distance traveled by auto = 4 * 30 = 120 km