Sumit wanted to pick up his bike parked at Ravi's house. He took an auto -rickshaw from his house to Ravi's house. The speed of the auto - rickshaw was 15km/h.He. He then drove back on his bike at the speed of 60 km /h.The entire trip took him four hours. how far is Sum it's house from Ravi's house?
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Answer:
time = distance/speed
t1= x/15
t2= x/60
total time, t1+t2 = 4
x/15 + x/60 = 4
75x/900 = 4
x = 48 km
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