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diff --git a/challenge-178/paulo-custodio/python/ch-1.py b/challenge-178/paulo-custodio/python/ch-1.py
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+#!/usr/bin/env python3
+
+# Challenge 178
+#
+# Task 1: Quater-imaginary Base
+# Submitted by: Mohammad S Anwar
+#
+# Write a script to convert a given number (base 10) to quater-imaginary base
+# number and vice-versa. For more informations, please checkout wiki page.
+#
+# For example,
+#
+# $number_base_10 = 4
+# $number_quater_imaginary_base = 10300
+
+def dec_to_base2i(n):
+    base = -4
+    result = ""
+    while n != 0:
+        i = n % base
+        n //= base
+        if i < 0:
+            i += abs(base)
+            n += 1
+        result = "0" + str(i) + result  # imaginary is zero
+    result = result.lstrip('0')
+    return result
+
+def base2i_to_dec(n2i):
+    base = -4
+    result = 0
+    digits = list(reversed(n2i))
+    for i in range(len(digits)):
+        if i % 2 == 0:  # real part
+            result += int(digits[i]) * (base ** (i // 2))
+        elif digits[i] != '0':  # imaginary part
+            raise ValueError(f"number {n2i} has imaginary component")
+    return result
+
+assert(dec_to_base2i(4) == '10300')
+assert(base2i_to_dec('10300') == 4)
diff --git a/challenge-178/paulo-custodio/python/ch-2.py b/challenge-178/paulo-custodio/python/ch-2.py
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+#!/usr/bin/env python3
+
+# Challenge 178
+#
+# Task 2: Business Date
+# Submitted by: Mohammad S Anwar
+#
+# You are given $timestamp (date with time) and $duration in hours.
+#
+# Write a script to find the time that occurs $duration business hours after
+# $timestamp. For the sake of this task, let us assume the working hours is 9am
+# to 6pm, Monday to Friday. Please ignore timezone too.
+#
+# For example,
+#
+# Suppose the given timestamp is 2022-08-01 10:30 and the duration is 4 hours.
+# Then the next business date would be 2022-08-01 14:30.
+#
+# Similar if the given timestamp is 2022-08-01 17:00 and the duration is 3.5 hours.
+# Then the next business date would be 2022-08-02 11:30.
+
+from datetime import datetime, timedelta
+import sys
+
+def next_business_date(date_text, time_text, hours):
+    date_str = f"{date_text} {time_text}"
+    date = datetime.strptime(date_str, "%Y-%m-%d %H:%M")
+
+    minutes = hours * 60
+    while True:
+        end_day = date.replace(hour=18, minute=0)
+        remain = (end_day - date).total_seconds() / 60
+        if minutes < remain:
+            date += timedelta(minutes=minutes)
+            return date
+        else:
+            minutes -= remain
+            date = end_day + timedelta(hours=(24 - 18) + 9)
+            while date.weekday() >= 5:  # skip weekend
+                date += timedelta(days=1)
+
+if len(sys.argv) != 4:
+    raise ValueError("usage: ch-2.py yyyy-mm-dd HH:MM hours")
+
+result_date = next_business_date(sys.argv[1], sys.argv[2], float(sys.argv[3]))
+print(result_date.strftime("%Y-%m-%d %H:%M"))